Uwosh.meeting

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- updated project URL and pypi classifiers

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- added tests

- fixed problem with removal of attendee that had only Editor role

- Owner role now gets "uwosh.meeting: Add Meeting" permission by default

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- automatically installs Products.ATBackRef

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- notification email message includes attendees email address;
wording change from "has invited you to" to "has shared the following
meeting"

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- fix bug when removing an attendee that had Editor role

- improved handling of members without email addresses or full names

- notification email message includes next and previous meeting URLs
and lists attendees' full name as well as ID

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- update product description

- add "add attachment" link to the meeting_view.pt

- add "view" link to calendar view

- move the "allow discussion" setting to the default schemata

- added instructions on how to get published Meeting objects to
show up on the calendar portlet

- added previousMeeting and nextMeeting attributes that use ATBackRef
to show bidirectional relations between Meeting objects; requires
separate installation of Products.ATBackRef