Related: #i56998# use FUNIT_PERCENT on fields that allow relative value

(cherry picked from commit fc6fc5b576b972a8ea0551091cc57aa1cfe1334d)

Conflicts:
	svtools/source/control/ctrlbox.cxx
	svx/source/dialog/relfld.cxx

Change-Id: Ic8f0f550dbbcab0678fbeb9bf45a478b0cea642d