EDIT

fix #7682 set Point.precision to null where 0

fix 8004 add sortindex to DescriptionElementBase

add framework for schema update to 5.5

ref #8118 fix compile error in SequenceTableCreator

revert commit ff21181c

mend

ref #7599: minor

fix #7469 fix column type changer for Postgres

fix #7468 fix update script for mediaCreated in PostGreSQL

ref #7334 error handling in update script for pp synonyms

Add SchemaUpdater_50_51 and remove mediaCreatedOld (ref #7414)