4/7/10: fixed by ulf1- [#764078] warning: Invalid argument supplied for foreach() in rsvp/modules/og/rsvp_og.module if user
                       does not belong to any OG group.

[#689126] logic error to print out message 'New guests have been added. Do not forget to send the invitation.'

                                    If you use "rsvp event connector", please disable, store and enable "rsvp event connector" again.
                                    Fixed handling for reply_start and reply_end fields.

[#517462] fixing "Warning: Illegal offset type in isset or empty" errors when deleting nodes containing invitations.

-made some descriptions clearer.

[#528194] pass-on input variables so that other template_preprocess functions have still access to the raw data.

[#531042] Access Denied Error when affirming open invite "yes - attending" because of issue with closed signups.

Invitation page header showed event subject and not the invitation subject. (User X has invited you to Y).
"No invitation sent [Send invitation]" block in guestlist always visible (not just for maintainer).

Date connector: Date format in invitations was not based on date settings. Now it uses the "Default Display" setting of the field.