IDE-886 Allow % when editing layout column weight #resolve

Allow percentage sign % when editing column weight
in properties view for liferay layout template editor.
IDE-932

Make sure to only show the superclasses in the dropdown
list that exist and have correct type hierarchy.
IDE-933 IDE-942

Fixed ext project facet install handler
that was broken with flexible project layout support
recently added.
IDE-931 Support custom portlet categories in portlet wizard #resolve

extend the search mechanism of pulling categories to not only look in the current portlet project's custom categories in liferay-display.xml, but also in all the other portlet plugin projects' custom categories.
IDE-931

modified foundDuplicate variable's location in previous commit.
IDE-945 updated dtds and xsd for 6.2.0-M5 #resolve
IDE-932

Make sure the default superclasses show up when
creating custom portlet class during new liferay project
IDE-886

Make sure it only works with the sole ending %
IDE-931

modified the null project portlet creation bug in ticket IDE-931