Store secondary email addresses.

Create a place to store additional email addresses and
provide an API to access them
Make sure no secondary email addresses are used for registration or when changing email address
If secondary mails exist, print them in account settings, and allow to delete them
Add UI for adding secondary email addresses
Manage addition of secondary emails
Use all registered email addresses to map Scm users to IDF users.
Login form enhancement
Add more statistics on the projects list page
Merge branch 'master' into develop
Merge branch 'master' into develop
Remove echo for printf
Check if 'src/IDF/conf/path.php' exist before use it
Update pot file and translations from source and transifex updates
Rewrite a string to better handle i18n
Merge branch 'develop' of projects.ceondo.com:indefero into develop
Enhancement of the invalid revision handler
Show the list of available branch
Fix issue 616
Patch from Patrick Georgi
Fix issue 591
Improve render of issue tag list
Apply the UI enhancement of issue tags cloud to wiki and download part too.
Improve the english a bit and make the previous error message cleaner
* update pot and po files with latest strings from source and tx
* finalize German translation (again)