Allow readline that doesn't support -f

* OSX's readline doesn't support -f. Default to current shell argument
  to allow script to continue.
* Added set -e to ensure any command that fails aborts script.
setup.sh optionally forks and added profile.

bashrc -> bashrc.prompt
bashrc -> full bashrc to replace .bashrc
setup.sh looks for FILES += bashrc profile
setup.sh looks for EXECUTABLE += st stow
setup.sh with any argument symbolic links in .bashrc instead of appending
Added script to fetch and compile suckless tools

suckless tools: st wmname
Added autologin for screen shells and visual bell.
Customizations for vimrc.
bind b banishrel, and added volume buttons
Don't download source if we have it already.
Removal of AMANPATH environment variable nonsense.