Auto-completion in XYZCommander

[Max E. Kuznecov]

Hi!

I've implemented a new plugin (:core:complete) and committed it to
trunk (will be available in 0.0.4).
Plugin provides ability to auto-complete provided text in different domains.

Currently two domains implemented:
* binpath - searches through directories defined in $PATH variable
* fs - searches through filesystem hierarchy

It is also very easy to extend the plugin by implementing more complete domains.
The next one will be - xyzcmd, which allows to complete xyzcmd
internal data and functions (it is useful for management console)

Auto-completion dialog can be called by pressing Alt-Tab by default.

--
~syhpoon