Bug 1621247: Allowing the substandards to be properly hierarchical

This patch:
 - removes the need to set priority value in .matrix file
   they are worked out now based on the array generated
 - changes the way you indicate parent/child relationships by adding a
   'uniqueid' to the parent and change 'parent' value for its children
   to the value of the uniqueid
 - stopped an element showing the dot on the matrix if it has children
 - added indentation for the name (1st) column on matrix page so we
   can see how things relate to each other better

behatnotneeded

Change-Id: I434c495aa58e41f9f2e55da8d6f70b9c1da37038
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>