Add the country code if not filled by the user - adds country code again on second edit/save

this might be relevant #831220: Greek phone numbers

If you ask me the logic of each country should be done by core
and only validation should be done by the country code

complementary idea is to #174262: Store raw number in database, format on ouput

here is a patch that works in my case
accepts +30 9999999999 and 9999999999 formatted numbers

while not complete its acceptable for me
(I don't have a big experience with regular expressions to accommodate other formats)

I am also attaching the modified phone.el.inc for easy testing
rename phone.el_.inc_.txt to phone.el.inc and put in the phone folder and accept overwriting old file

corrected error message in patch (nothing functional changed)