upgrade-5.9.1d4-5.9.1d5.sql

Content-Repository Reform : Reduction of number of functions in
the content repository for PostgreSQL by using using argument defaults
(while providing compatibility for clients using old versions):
- reduced number of versions of content_item__new from 12 (!) to 6 by using defaults
- commented differences
- commented arguments of plpgsql functions with long argument lists
- reduced code duplication by basing one version of content_item__new/17 directly on /20
- marking on version of content_item__new/17 and content_item__new/6 as deprecated

- reduced number of versions of content_revision__new from 7 to 4 by using defaults
- commented differences
- marking on version of content_revision__new/7 as deprecated
- let automatically generated functions call directly content_revision__new/13
- remove space from automatically generated functions
- updated automatically generated functions for all types of the content repository

- reduced number of versions of image__new from 4 to 2by using defaults
- reduced number of versions of image__new_revision from 2 to 1 by using defaults