pithos: Fix sqlite backend

Related commit:https://github.com/papagian/synnefo/commit/6b3f6caee75841e59cc83e1fa6076261cb462c44
branding: Change console logo image

Closes grnet/synnefo#147
astakos: Improve project notification emails
astakos: Validate input of project application

Check max values and update tests accordingly.
astakos: Move checks from api to project functions

Collect all validation checks in functions.submit_application; also
improve name check.