Version 1.0.01: Add user groups and alternative proposals

The meeting schedule version 1.0.01 adds some feature suggested by the first users

• TinyMce Editor for the Header/Footer
• Filtering of proposals based on the User Groups
• Add several king of decisions type like (combo box, radio button, check box, free text and display only)
• Give the possibility to make an alternative propsal in the front-end.
• Use Lock/Unlock of existing attendees to make the user interface more user freindly