Set the type of a constraint.

The type ( type) of a linear constraint may be set to one of:

CT_EQ	Equality, `='
CT_GEQ	Greater than or equal to, `≥'
CT_LEQ	Less than or equal to, `≤'
CT_UNB	Non-binding constraint
CT_SOS1	Special ordered set of type 1
CT_SOS2	Special ordered set of type 2

Values applicable for unary constraints only are:

CT_CONT	Continuous
CT_INT	Integer
CT_BIN	Binary
CT_PINT	Partial integer
CT_SEC	Semi-continuous
CT_SINT	Semi-continuous integer
CT_FREE	Free

gettype