xinitrc: switch back to ssh-agent

As gnome-keyring is not able to cope with all types of keys.

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
vimrc: map CTRL-C to copy to the CLIPBOARD buffer

Where CTRL-C from virtually all other programs copy the data, too.

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
vimrc: enable mouse mode (selectively)

Only enable it in X11 environment.

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>