moved ProrXhtmlSimplifiedHelper from edit utils to reqif10 utils

plugins using this util should not have dependencies to an editor package if not necessary
Merge branch 'develop' into filtersearch
implement correct way to get xhtml source
Merge branch 'filtersearch' of ssh://git.eclipse.org:29418/rmf/org.eclipse.rmf into filtersearch
Merge branch 'filtersearch' of ssh://git.eclipse.org:29418/rmf/org.eclipse.rmf into filtersearch

Conflicts:
	org.eclipse.rmf.reqif10.search/src/org/eclipse/rmf/reqif10/search/filter/XhtmlFilter.java