retire vimps1, vcprompt cannot work within it anymore

Since vcprompt:

changeset:   102:10dc39e94af8
user:        Greg Ward <greg@gerg.ca>
date:        Tue Oct 30 19:42:02 2012 -0400
summary:     git: use capture_child() instead of system().

It would result an error about undefined symbol: xread

Switch back to old Bash PS1.
fix eix color after updated to 0.29.3
fix gentoo-sources with revision number causing filename becomes "...-gentoo-gentoo-..."