Move vlf information from buffer name to the mode line.
Fix whole file reload in read-only buffer on vlf-mode exit.
Back to using per buffer profiling for encode speed.
Forbid short-cutting in line search.
Optimize unconditional chunk loading and prefer it in more cases of
overlapping batch moves.
vlf-occur changes:
- support multi-line matches
- divide user regex search from line counting
- fix wrong last match overall position
- fix edge cases of incorrect line numbers, matches in last chunk line
which is incomplete