Merge pull request ctrlpvim#561 from obcat/restore-line-prefix

Restore line prefix

Removed forced redraw in buildprompt function.

This seems to have eliminated the worst of the delay.  Issue is in how
VIM is redrawing the display.  Update is slightly slower without (like
lazy but without the wait before the update)

Merge pull request ctrlpvim#329 from ctrlpvim/release1.80

release 1.80

Version 1.79

Version 1.78

Ver bump

Ver bump

Fix last entered sorting

Use :undolist for older Vim versions

Improve :

* Improve s:sanstail() and ':' input
* Shorten s:samerootsyml(), s:ispathitem()
* Add g:ctrlp_log, an option to write all output to .ctrlp_cache/ctrlp.log
* Fix an error with ctrlp#utils#glob()