deploy: install Dropbox CLI, use it to install Dropbox and start daemon

Handily, I found that the Dropbox CLI can install Dropbox for you when you
try to start the daemon. It requires a few modifications to the script
because it would normally prompt for "Are you sure you want to install?".
I just remove the lines.

I also fix their "running" command which returns 1 for True (is running)
and 0 for False (is not running), which follows Python's interpretation
of True/False as integers but not Unix-style exit codes.
bashrc FM: use $PWD variable and set noisy output to /dev/null

It seems like navigating to a directory containing symlinks causes
gnome-open to complain so shut it up.
bashrc GIMP: function wrap gimp so it doesn't output debug on startup