Spell bash's pathname in full

So that clicking the icon on the start bar can find it.

modified:   .exrc
Git to ignore vim swap files, to accept aliases

These changes get the Msys setup closer to the one in Linux.

modified:   .gitconfig
    Many layout changes.
    Added [alias].
    Consolidated [core].
modified:   .gitignore
    Ignore *.swp
Clean-up options background, tags, directory

No changes, just clean-ups, except for reordering 'directory' to try "~/tmp"
ahead of "." (to avoid annoying git with swap files).

modified:   .gvimrc
modified:   .vimrc