Change firefox and sumatra to iceweasel and evince
Remove F11 binding to emacs_fullscreen.exe
Change %HOME% to ~ in paths
Remove hack where I CC myself on all sent emails

Not necessary on Linux because its starttls can properly retrieve sent emails
from gmail.
Don't use fakecygpty with tramp's ssh

It was only necessary on Windows with cygwin.
Merge branch 'switch-to-linux'