enable use of database for efex calibration settings with MC

In switching over to the database values, this actually flagged up some bugs in the simulation... fixed by switching all et unsigned int values to int, since et values can be negative, as well as fixing an issue with the loading of the database parameter values (it was the latter that was the real issue ... wasn't seen in data b.c. the values in the database happened to be the same as values it should have been loading from another attribute (tile and hec were both set to 0 in the range that was being misloaded (was loading hec value when should have loaded tile).