Upgrade scripts contain the following changes: - getting right name of triggers, following the pattern *_tr - redefining funtion arguments for each function using define_function_args - getting rid of unncesary backslashes, used for escaping, in some functions. - redefinitions of content_type__refresh_trigger and content_type__drop_type in order to get rid of some 7.2 vs 7.3 querying.