Removed nagscreen informing of 2.6.0 news that would periodically tell
you about 'new' things in taskwarrior by telling it i already saw it.
Removed perviously added auto-sync function. Two reasons:
The individual additions/modifications in taskwarrior take longer if
they need to be communicated to a server at the end of every change.
And undo does not work at all if we are already syncing to a server
after every change.
That means wrong changes are also synced and become really hard to
remove again.
So, it seems easier to, for now, sync manually after some commands and
before leaving one workstation for another. Another method of auto-sync
could be implemented but I have not found an elegant way.
Now silently syncs in the background instead of blocking input. *May*
produce zombie processes in rare circumstances? Will need to investigate
it some more.
Behind the scenes, the shell script has been replaced by a python script
which creates a (disowned) background process which attempts the
syncing.
