Added global option + malformed email + cleaning

- Added 'panelDisplayLocation' option to choose where to show the subscription form
- Manage malformed email (it crashed EPL)
- Brought back popup form to subscribe (with the new options + unsubscription)
- Popup form is a copy of the form in mysettings menu, so no more 2 html codes in 2 different places
- On unsubscription, only remove the email from "globalAuthor" row if the email is the same.
- Put all css styles in css file
- Some cleaning
Removed trailing space