(hippie-expand-dabbrev-skip-space): Renamed `he-dabbrev-skip-space'.

(hippie-expand-dabbrev-skip-space): Renamed `he-dabbrev-skip-space'.
(hippie-expand-dabbrev-as-symbol): Renamed `he-dabbrev-as-symbol'.
(hippie-expand-no-restriction): New variable.
(hippie-expand-only-buffers): New variable.
(he-init-string,he-line-search,he-list-search,he-dabbrev-search): Use
`buffer-substring-no-properties' to avoid transfer of text properties.
(he-dabbrev-kill-search,he-whole-kill-search): Remove text properties
from search result.
(he-regexp-member): Removed function.
(he-buffer-member): New function used instead of `he-regexp-member'.
(try-expand-line,try-expand-line-all-buffers,try-expand-list,
 try-expand-list-all-buffers,try-expand-dabbrev,
 try-expand-dabbrev-all-buffers): Depending on
`hippie-expand-no-restriction', widen the buffer before search.
(try-expand-line-all-buffers,try-expand-list-all-buffers,
 try-expand-dabbrev-all-buffers): Use `he-buffer-member' and
`hippie-expand-only-buffers'.