First commit after switching to Git

Things to be done in the nearest future:
- delete token-end from TeX+-token-at-point
- change the output of TeX+-token-at-point
- change forward-char and backward-char to goto-char
- deal with the case of a backslash at the end of buffer
Deleted token-end
token-start renamed to opoint
Changed the output of TeX+-token-at-point to a three-element list

The first two elements are the start and end positions of the token,
the third one is the type of the token.  TeX+-forward-token and
TeX+-backward-token are changed accordingly.
Merge with newly created github repo
Added a comment regarding safety of one instance of forward-char