Postgres Compatibility Pre 9.6

The following is a list of items that require attention to make ClassDB compatible with Postgres versions prior to 9.6.

Please add every item discovered to this table so we get a full picture before creating and addressing them as issues.

Do not create issues for these items until after Milestone M3 is complete and we have had a chance to review these items.

Item	Description	pg version changed in	Source file(s)
GRANT	Syntax changed	9.5	initializeDBCore.sql
pg_signal_backend	Role added	9.6	initalizeServerCore.sql, addConnectionMgmtReco.sql
ALTER SYSTEM	Statement added	9.4	enableConnectionLoggingReco.psql, disableConnectionLoggingReco.psql
IF NOT EXISTS	Option added to CREATE INDEX	9.5	addRoleBaseMgmtCore.sql
pg_event_trigger_ddl_commands	Function added	9.5	addDDLActivtiyLoggingReco.sql
IF NOT EXISTS	Option added to ADD COLUMN	9.6	addUserMgmtCore.sql