Use curly braces around variables
Added script to remove backups

Still doesn't print the right info when so files match.

The script prints too much information when files don't need to be
deleted.
Don't attempt to remove non-existing backups
Back up files automatically on install
Quote paths
Don't back up files installed by script

Don't back up symlink files equivalent to symlinks created on install.
On install, overwrite any existing files (ignored by call to backup
from install script).