Changed to use overlays for hiding instead of selective display.
Commented out the support for XEmacs because it doesn't support overlays.
(hs-special-modes-alist): Added support for java-mode.
(hs-minor-mode-hook): New variable.
(hs-c-start-regexp, hs-c-end-regexp, hs-forward-sexp-func)
(hs-block-start-regexp, hs-block-end-regexp)
(hs-find-block-beginning): Doc string fixes.
(hs-hide-comments-when-hiding-all): New variable.
(hs-safety-is-job-n, hs-minor-mode, hs-flag-region):
Use overlays for hiding.
(hs-inside-single-line-comment-p, hs-discard-overlays)
(hs-already-hidden-p): New internal functions.
(hs-hide-block-at-point, hs-hide-initial-comment-block)
(java-hs-forward-sexp, hs-mouse-toggle-hiding): New functions.
(hs-inside-comment-p, hs-hide-block)
(hs-show-block): Added support for single line comments.
(hs-hide-all): Added support for hiding comments.
where an overlay extends on both sides of the region.
(outline-mark-subtree): New function.
(outline-mode-prefix-map): Put outline-mark-subtree on C-c @.
(grep-command): Use it, and test whether it supports the -e
option; fix doc string (last command is stored in history variable).
(grep-null-device): Declare before grep-program and grep-command.
(grep-find-use-xargs, grep-find-command, grep-find-history):
New variables.
(grep-find): New command.
(grep): Only concatenate grep-null-device to COMMAND when it's
not nil (to support grep-find).
(makefile-backslash-region): Re-imported from cc-mode; modified to
handle makefile-backslash-align.
(makefile-append-backslash, makefile-delete-backslash):
Re-imported from cc-mode.
(makefile-backslashify-current-line): Function deleted.
(makefile-fill-paragraph): New function.
(makefile-mode-map): Bind C-c C-c to comment-region.
(makefile-mode): Set fill-paragraph to makefile-fill-paragraph.
(imenu--generic-function): Fixed probably a typo: named appeared
twice in an item. Put function after name and beg in a special
item because a normal item has name and beg (for orthogonality).
(imenu-add-to-menubar): First test to see if the mode supports imenu.
(imenu--menubar-select): Use the defined variable imenu-rescan-item.
(imenu-default-goto-function): New subroutine, broken out of `imenu'.
(imenu-default-goto-function): New variable.
(imenu): Made it use the above function, via that variable.
ignore subprocess input and respond only to keyboard.
(non_process_wait_mask): New variable.
(add_keyboard_wait_descriptor): Update it.
(delete_keyboard_wait_descriptor): Update it.
(init_process): Initialize it.
(Fkill_buffer): Call frames_discard_buffer.
(record_buffer): Move buffer to front of frame_buffer_list.
(Fother_buffer): Use frame_buffer_list.
(init_buffer_once): Set up display_count.
(syms_of_buffer): Set up Lisp variable.
