(hippie-expand): Removed bug - don't undo from another buffer.

(hippie-expand): Removed bug - don't undo from another buffer.
(he-reset-string): Removed bug - don't move markers.
(he-capitalize-first): New function, defining new "case".
(he-transfer-case): New function.
(he-transfer-case-ok): Function removed.
(he-substitute-string,he-ordinary-case-p,he-string-member): Use the
new functions above, for the new case handling.
(he-file-name-chars): New variable.
(he-file-name-beg): Use `he-file-name-chars'.
(he-file-name-nondirectory,he-file-name-directory,
he-file-directory-p,he-concat-directory-file-name): New functions
to handle VMS and PC filename formats more accurately.
(try-complete-file-name,try-complete-file-name-partially): Use the
new functions above.
(try-expand-line-all-buffers,try-expand-list-all-buffers,
try-expand-dabbrev-all-buffers): Use `case-fold-search' from the
original buffer.
(he-line-beg): Removed bug that made point move.
(try-expand-all-abbrevs): Check that abbrev tables exist before use.
(try-expand-dabbrev-visible): New try function.
(he-search-window): New variable used by `try-expand-dabbrev-visible'.
(he-dab-search-regexp): Function removed.
(he-dab-search): Renamed to `he-dabbrev-search'.
(he-dabbrev-search): Find only whole matching symbols.
(he-dabbrev-skip-space): New variable.
(he-dabbrev-beg): Use `he-dabbrev-skip-space'.
(try-expand-dabbrev-from-kill,he-dabbrev-kill-search): New try
function, with requisites.
(try-expand-whole-kill,he-whole-kill-search,he-kill-beg): New try
function, with requisites.
(he-search-loc2): New variable, used by `try-expand-whole-kill'
and `try-expand-dabbrev-from-kill'.
(hippie-expand-try-functions-list): Added the try functions
`try-complete-file-name-partially', `try-expand-dabbrev-from-kill'
and `try-complete-lisp-symbol-partially'.
(Several functions): Adjusted and corrected use of `he-tried-table'.