* add search modes:
copy-matching-lines, kill-matching-lines, list-matching-lines
- add enum for search modes
* add search flag support in all search functions:
search_forward, search_backward, count-matches, delete-matching-lines,
delete-non-matching-lines, copy-matching-lines, kill-matching-lines,
list-matching-lines, query-replace, replace-string
- highlight matches during search string input
- add search flag toggle functions in minibuffer_edit
same code and bindings as for incremental search
- add handlers in CompletionDef for minibuffer_edit session start and end
- use generic search tag system to store flags in search string
* misc improvements and bug fixes:
- test and set append-next-kill on kill-region
- split `do_copy_region` from `do_kill_region`
- remove argument in `do_kill_region` for `kill-region`
- change immediate string argument code letter from 'S' to '@'
- exit popup with do_popup_exit() in do_keyboard_quit
remove popup_mode binding
- add ESiii and ESsii command calling conventions
- pass key and argval to:
minibuffer_complete, do_minibuffer_complete_space,
do_minibuffer_electric_key
* add default bindings:
`next-error` on `M-g n`, `M-g M-n`
`previous-error` on `M-g p`, `M-g M-p`
`goto-line` on `M-g g`, `M-g M-g`, `C-x g`
`goto-char` on `M-g c`
* bump version to 5.4.1a
6880277ec0