proced magic for Erlang nodes

View only BEAM processes, and see the node name (as provided on the
command line).
Set SMTP server depending on From address
Fix colour for org-clock mode line indicator

The mode line indicator for the currently clocked in task always uses
the "active mode line" background colour, even if the buffer in question
is not selected.  With this hack, the colour agrees with the rest of the
mode line.
When switching away from Emacs, use inactive mode line face