Beginnings of ExactCalculator based on L

Replace the arity library with a new evaluation engine based on
an open source "constructive reals" library.  This provides answers
that are correct to the last displayed digit, and can be scrolled to
get more precision, with evaluation to additional precision
proceeding on demand.

This uses pieces of an old prototype calculator with a
pre-Material-Design UI.  Since the code structure of the KitKat and
Lollipop calculators is quite different, this merge required major
changes to make the pieces fit again.  An egregious bug in the
prototype related to the evaluation of the power operator was
fixed.  Many new UI bugs are introduced to compensate :-)

Add separate buttons for inverse trig functions.

Add long TODO lists for various missing pieces.

This is really designed to get something up and running
that looks like it has a Material Design UI.

This version kind of works, though with many UI deficiencies.

This addresses external issues 63368, 81089, and 80990.  It
partially address the degree vs radian (80330) issue as well,
though we're still missing the UI for that.

This fixes

Bug:15284587

(More work is needed to make this interact correctly with keyboard support.)

Degree/Radian mode is also internal

Bug:17059768

This provides much more robust solutions to the following, which were
previously fixed by favoring round numbers over precise solutions:

Bug:15747298
Bug:15332726

Change-Id: Ib64ffcee9760a3195ae2a48302308eeb09a156bd

1 files changed, 25 insertions, 0 deletions

diff --git a/assets/about.txt b/assets/about.txt
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+The calculator uses a software implementation of arithmetic remembers how each number was computed, and always knows how to evaluate each intermediate result to any given precision.  Numbers are reevaluated as you scroll.  
+
+The underlying open source library was previously distributed as part of the "CRCalc" calculator.  The version distributed here was very slightly modified.
+
+The library and its original test code is distributed under the following open source license:
+
+Copyright (c) 1999, Silicon Graphics, Inc. -- ALL RIGHTS RESERVED
+
+Permission is granted free of charge to copy, modify, use and distribute this software  provided you include the entirety of this notice in all copies made.
+
+THIS SOFTWARE IS PROVIDED ON AN AS IS BASIS, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES THAT THE SUBJECT SOFTWARE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING.   SGI ASSUMES NO RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE.   SHOULD THE SOFTWARE PROVE DEFECTIVE IN ANY RESPECT, SGI ASSUMES NO COST OR LIABILITY FOR ANY SERVICING, REPAIR OR CORRECTION.  THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY SUBJECT SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
+
+UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER TORT (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE OR STRICT LIABILITY), CONTRACT, OR OTHERWISE, SHALL SGI BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER WITH RESPECT TO THE SOFTWARE INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, LOSS OF DATA, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF SGI SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES.  THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY RESULTING FROM SGI's NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH LIMITATION.  SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THAT EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.
+
+These license terms shall be governed by and construed in accordance with the laws of the United States and the State of California as applied to agreements entered into and to be performed entirely within California between California residents.  Any litigation relating to these license terms shall be subject to the exclusive jurisdiction of the Federal Courts of the Northern District of California (or, absent subject matter jurisdiction in such courts, the courts of the State of California), with venue lying exclusively in Santa Clara County, California.
+
+Copyright (c) 2001-2004, Hewlett-Packard Development Company, L.P.
+
+Permission is granted free of charge to copy, modify, use and distribute this software  provided you include the entirety of this notice in all copies made.
+
+THIS SOFTWARE IS PROVIDED ON AN AS IS BASIS, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES THAT THE SUBJECT SOFTWARE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING.   HEWLETT-PACKARD ASSUMES NO RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE.  SHOULD THE SOFTWARE PROVE DEFECTIVE IN ANY RESPECT, HEWLETT-PACKARD ASSUMES NO COST OR LIABILITY FOR ANY SERVICING, REPAIR OR CORRECTION.  THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY SUBJECT SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
+
+UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER TORT (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE OR STRICT LIABILITY), CONTRACT, OR OTHERWISE, SHALL HEWLETT-PACKARD BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER WITH RESPECT TO THE SOFTWARE INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, LOSS OF DATA, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF HEWLETT-PACKARD SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES.  THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY RESULTING FROM HEWLETT-PACKARD's NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH LIMITATION.  SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THAT EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.
+
+