Task #10810 - Postgres database is now created and populated for tests. Added some simple tests that directly operate on the database directly or through RADataBase.

Task #9893: RA DB sql: clean cherry pick merge on .sql files and .py generators from SAS-RA_DRAGNET-Task9939 branch. This concerns commits r36414,r36422,r36449,r36450,r36464,r36503,r36504,r36505,r36507,r36559,r36560

Task #9939: RA DB sql: remove earlier added DRAGNET max fill percentage. Rename CEP4 max fill percentage to a ratio

Task #8570: renamed dir from ResourceAssignmentDatabase to ResourceAssignmentDatabase.from_branch_to_prevent_svn_conflict to prevent svn EvilTwin merge conflict. Rename back on trunk.