Design
------
All configuration information will be in the directory
$HOME/.pms/
Directories:
	aliases/<name>/* -- each file's contents is an address
	signature.py -- a file containing code to print a signature to 
	                sys.stdout
	headers.py -- file containing code to print standard headers to 
	              sys.stdout
	scripts/*.py -- all these are run at the beginning
	status -- a pickled version of a Status class, so we can reload as
                    often as we want
	servers/<name>.py (contains a function called "server" which, when
	        run, returns a Server)
	special/<purpose>/{server,folder} -- the name of the server and the 
	         folder inside it which we're using for <purpose>
	config/{new,new_reply,send,show,edit_draft}/* -- directives for each 
	                                                 action 
