Add script to link files; mod tabs in Setup.sh.

Add:
	shell_scripts/dotfilesLink.sh
		-bash script to remove config files from ~/, and create symlinks with
		identical names to their counterparts in ~/.dotfiles/; to be used when
		working on a new remote machine.

Mod:
	shell_scripts/dotfilesSetup.sh
		-soften hard-tabs in header-comment to preserve formatting.