Improve file operations speed
Refactor file refreshing
Fix bug with files mode while copying
Add tab list history
Use counter instead of localtime for tab history
Refactor jump history (remove jumps limit)
Improve activebufline finding
Refactor jump history
Refactor tab and buffer jumping
Allow close or delete an unsaved buffer

Inform and ask when such case is detected.
Refactor and introduce smart search history

From now, the search history behaves different depending on the context.
For files mode it holds separated entries. For single tab mode it mixes
that tab entries with file ones. For all tabs, it mixes all tabs and
files.

Also, the g:ctrlspace_max_searches limit has been removed.
Support older Vim versions

Use own versions of gettabvar() and getbufvar() with default values.
Fix issue #18.
Clean up the tab name status segment

Since we have tab list view, we don't have to see total tabs count.
Simplify settings and options
Update README
Update README
Improve statusline and remove cyclic list
Improve statusline
Refactor status line function
Improve statusline