New interfaces for "meta ontology elements"

Conflicts:
	src/ch/uzh/ifi/attempto/acewiki/gfservice/GFEngine.java
	src/ch/uzh/ifi/attempto/acewiki/gfservice/GFHandler.java
	src/ch/uzh/ifi/attempto/acewiki/gfservice/TypeGfModule.java
	src/ch/uzh/ifi/attempto/acewiki/gui/ArticlePage.java
	src/ch/uzh/ifi/attempto/acewiki/gui/WikiLink.java
Add missing class: GeneralPage
Adopt minor changes from GF branch
Merge remote-tracking branch 'origin/master' into gfservice

Conflicts:
	src/ch/uzh/ifi/attempto/acewiki/core/FileBasedStorage.java
	src/ch/uzh/ifi/attempto/acewiki/core/GeneralTopic.java
	src/ch/uzh/ifi/attempto/acewiki/gui/ArticlePage.java
	src/ch/uzh/ifi/attempto/acewiki/gui/GeneralPage.java
	src/ch/uzh/ifi/attempto/acewiki/gui/WikiLink.java