Patch contains following changes: * Added "ctype" in keyword list as RESERVED * Added support for COLLATE, CTYPE & CONNECTION LIMIT in pgDatabase * Added reverse engineering support for SQL generation from existing schema * Added these variable in properties list. (Made them disabled for the not-supported versions of PostgreSQL) * Added them in property list (forgot to add it in the previous patch) * Used wxTextCtrl instead of wxSpinCtrl for connection limit control in properties dialog, as we don't want to put any restriction on the maximum limit for it.
