Add fso-status-buffer-hook for changing *FSO Status* contents

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Bury calls buffer after the last call ended (if it's set to auto-popup)

Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Add GSM monitoring facilities; bump version to 0.2

Signed-off-by: Paul Fertser <fercerpav@gmail.com>