Redo the postilion port: - Don't use the imap library that comes with it --
use the cclient port. Don't even extract it. - Don't bother patching
configure and Makefile.in(s) -- use a local Makefile. - Use the latest
TCL/TK 8.3. This port does not provide any loadable packages, so I chose
not to use tclstubs, but link with libtk and libtcl directly. - Remove
the tkstep cruft -- it was commented out since forever. - Finally fix the
options.tcl -- the env(MAIL) logic was backwards.