Restored arguments for mapper_expr_evaluate().

And one more...
Added remaining connection props to flags; only attempt to set connection ranges if appropriate types and vector lengths are known.
Allocate memory for connection ranges when needed.
Corrected arguments for mapper_expr_evaluate()
Can't use memcpy for signal value -> mval union.
Fixed error-checking for boundary processing.
Fixed error-checking for setting linear expression.
Pass mapper_db_connection_t to mapper_msg_prepare_params()
Removing references to obsolete range property.
Python bindings: adapted typemaps for vector minima and maxima in db_connection struct.