vim/vimrc: Disable rubycomplete.
bash/bashrc: Export PS1_PLAIN.
bash/bash_aliases: Cleanup and extensions.
bash/bash_scm_info (__scm_info): Directory may no longer exist.
bash/bash_scm_info (__svn): Use __svn_version.
bash/bash_scm_info (__git_stale): Mark untracked files.