Log Message:
Update to 2.25
all changes for pthai.el
- consider numbers as being in the dictionary
- various fixes to handle when point at thai character and not word
- simplify and fix some lookup-at-point functions
- add option to pthai-practice-* to practice words without audio
- rename 'pthai-fetch-thailanguage to 'pthai-fetch-thai-language
- rename 'pthai-dictionary-grep to 'pthai-dictionary-find-word
- rename 'pthai-unknown-words-insert to 'pthai-unknown-words-extract
- add counting by letter function 'pthai-dictionary-word-counts
- many small cleanups