When there is more than one instance of a name in the Contacts, it
gets a very high weightage and can override corrections for very
high frequency words such as "the".

This fix prevents multiple occurences from increasing the frequency
of a contact and also from bumping it above 255, which is the frequency
of "the", "is", etc.

Comparisons were always happening with lowercase version of the typed
word, which wouldn't match the uppercase word in the dictionary, so it
became an unrecognized word when typed in full. Highlight was then going
to the next word in the list.

Fix compares the lowercase and uppercase versions of the word for
validity.

Merge from eclair-mr2

Approver: jerryw

* changes:
  Fix for #2244624 : Keyboard freezes up sometimes