Fix install of vimfiles directory
Set personal user info in global gitconfig
Fix PATH not always set correctly

Make the PATH modification logic in bashrc more sophisticated.
Ensure dir_colors is loaded properly

Explicitly load the contents of the dir_colors dotfile in bashrc.
Add GNU Screen customizations

Tmux doesn't work with Cygwin, so this is my attempt to cram a square
peg (Screen) into the round hole left in my workflow by the absence of
Tmux.
Improve separation between Vim's dual identities

Improve separation between Windows' gVim and Cygwin's terminal Vim.
  - Fix issues on gVim with plugins that issue shell commands.
  - Separate the vim plugin directories between the two in order to
	avoid CRLF issues.
Remove aliases that don't make sense any more