Ticket #22 (closed enhancement: fixed)

Description (Last modified by thomase)

Depends on: #23, #27, #31, #33, #37, #38, #39, #44, #45, #46, #47, #48, #49, #55, #70, #88

Create a very simple, first approximation of our core (planned) GeographicEntity ContentType. Leave out bibliographic references for now, and keep things as simple as possible (e.g., no capacity for multiple geometries, vocabularies (integrating ATVocabularyManager is easier than not), etc.)