* Makefile.am: changed 'make tests' to use a concise output,
  scrolling to see where thing broke wasn't pleasant
* configure.in: some beta4 preparation, but not ready yet
* error.c globals.c include/libxml/globals.h include/libxml/xmlerror.h:
  new error handling code, last error informations are stored
  in the parsing context or a global variable, new APIs to
  handle the xmlErrorPtr type.
* parser.c parserInternals.c valid.c : started migrating to the
  new error handling code, it's a royal pain.
* include/libxml/parser.h include/libxml/parserInternals.h:
  moved the definition of xmlNewParserCtxt()
* parser.c: small potential buffer access problem in push code
  provided by Justin Fletcher
* result/*.sax result/VC/PENesting* result/namespaces/*
  result/valid/*.err: some error messages were sligthly changed.
Daniel

* parser.c include/libxml/xmlerror.h: factoring of more
  error handling code, serious size reduction and more lisibility
  of the resulting code.
* parserInternals.c parser.c include/libxml/parserInternals.h
  include/libxml/parser.h: changing the way VC:Proper Group/PE Nesting
  checks are done, use a counter for entities. Entities where freed and
  reallocated at the same address failing the check.
* tree.c: avoid a warning
* result/valid/* result/VC/*: this slightly changes some validation
  error messages.
Daniel

* parser.c: applied a couple of patches from Peter Jacobi to start
  to get rid of ctxt->token, with a possible significant speed
  improvement to be gained once done. Better compliance with PE
  references constructs in DTDs too.
* test/valid/t[0-9]* result/valid/t[0-9]*: added a set of tests
  from Peter too
Daniel