Default nonlinear handlers

Detailed Description

implementation files (.c files) of the default nonlinear handlers of SCIP

Files
file	nlhdlr_bilinear.c
	bilinear nonlinear handler
file	nlhdlr_convex.c
	nonlinear handlers for convex and concave expressions
file	nlhdlr_default.c
	default nonlinear handler that calls expression handler methods
file	nlhdlr_perspective.c
	perspective nonlinear handler
file	nlhdlr_quadratic.c
	nonlinear handler to handle quadratic expressions
file	nlhdlr_quotient.c
	quotient nonlinear handler
file	nlhdlr_soc.c
	nonlinear handler for second order cone constraints