just like before, if vpath contains ${u} then
the IdP-volume is created unconditionally
but this is new:
${u%+foo} creates the vol only if user is member of group foo
${u%-foo} creates the vol if user is NOT member of group foo
just like before, if vpath contains ${u} then
the IdP-volume is created unconditionally
but this is new:
${u%+foo} creates the vol only if user is member of group foo
${u%-foo} creates the vol if user is NOT member of group foo