xprofile: do not start gnome-mpris-inhibit
xprofile: do not add mostly-useless 'localuser' entry to xhost
xprofile: do not export env to systemd (for now)

Currently this is entirely useless. I might experiment with it later...
maybe when I finally get around to testing kdbus, as this line is
primarily for cases where $DBUS_SESSION_BUS_ADDRESS points to the user
bus, rather than the per-session one.
xprofile: redirect synclient to /dev/null

If the config file is empty (or entirely commented out), it will be
invoked with no arguments and will dump the current config instead.
xprofile: synclient: skip empty lines
xprofile: globalenv does not really depend on keyctl
Revert "xprofile: globalenv does not really depend on keyctl"

On the second thought, it might.

This reverts commit 422833c1c8b370fe635a0174b96d7379ba4ae7cc.
xprofile: just remove globalenv outright

Apparently I don't actually use it, and it's somewhat broken in cron
anyway. (Not sure if it is, really. But if I do `keyctl new_session`, it
can find the keys but not read them due to permission errors. I wonder
if cron calls pam_keyinit? If it does, then it'd get a link to the user
keyring and globalenv would work fine... Still.)
screen: remove termcap cargo

facit? hp700? wyse-75? Who the _hell_ uses those in 2014?

...alright, I use old crap sometimes, but DTTerm was the oldest yet.
xprofile: temporarily disable keyctl stuff

The kernel has been fixed so that gdm can safely invoke pam_keyinit.so
again (relevant Linux commit 3a50597de8635cd05133bd12c95681c82fe7b878).
Therefore manual setup should no longer be necessary, although still
need to check what `keyctl show` outputs, just in case...