Changes requested by majutsushi.
Changed function to :TagbarTogglePause
Added documentation for function, including usage and defintion.
Changed autocommands_enable to autocommands_enabled.
tagbar#PauseAutocommands :TagbarPause
:TagbarPause pauses autocmds, effectively freezing Tagbar on the last
file. Useful for keeping a tag reference for a file open whilst working
in a different file.
Files are now cached locally in a temporary file, and the parsing
happens on that file. This allows displaying tags for remote (Netrw)
files, and it will also make access to files on remote filesystems like
NFS and sshfs faster.
Additionally, tags are now always updated when the files are saved,
deprecating the tagbar_updateonsave_maxlines option. Otherwise checking
for changes in remote files would not have been possible.
If ctags isn't installed, then until now most of the autoload script
would have been skipped, leaving functions like tagbar#currenttag()
undefined. Move the ctags check to the exuberant-ctags checking function
to prevent errors in this case.
If tagbar#currenttag() was used in a statusline on a system that had
Tagbar installed, but not ctags, then an error was reported on every
statusline update. Change the ctags checking so that errors in
currenttag() fail silently while still reporting an error message if
Tagbar is opened normally.
If a tag was in a closed fold that was itself in a closed fold, and
those folds existed since the initial display (for example by using the
g:tagbar_foldlevel option), then intermediate tags could have invalid
tline values which resulted in the search pattern failing.
