PETALSSTUD-308: SUs should be ordered in the selection list used to add
a SU to a SA
PETALSSTUD-309: Support multi-selection when adding SUs to a SA
PETALSSTUD-307: SU already added to a SA has not to be in the selection
list
PETALSSTUD-310: XSL stylesheet not imported when creating an XSLT SU
PETALSSTUD-297: Petals Development menu appears on Git repositories
PETALSSTUD-305: Operation helper does not work well with autogenerated
end-points (EIP)