[bash] Add ~/local/bin to PATH.
[hg] Add aliases qcat{next,prev} and q{head,tail}.
[hg] Add hgsubversion extension.
[x11] Whitespace cleanup.
[hg] Ignore *.pyc files.
[riverside] Add environment setup for riverside.
[w3m] Ignore history.
[emacs] Customize indentation to four spaces.