Renamed the original INSTALL.md to EXAMPLES.md and created a new
INSTALL.md

Thanks to Gernot Schulz for writing most of the new content. It somewhat overlaps with INSTALL, but more docs are better either way.

Conflicts:
	INSTALL

Thanks to Gernot Schulz for most of the changes

As this is non-destructive, people may prefer it

* Fixed issue where vcsh init & clone would print help as they
  tried to call currently non-existant vcsh use

* Has been tested on my and other's machines for months
* Includes zsh completion
* Does not support `vcsh use`, but in a releasable state otherwise

* This version should be fully POSIX shell compliant
* Quoted all variables withing [ ]
* Added debugging and verbose output via shell variables
* Cleaned up INSTALL