Polynomial cone cutting plane closure

[nclskoh]

• PolynomialConeCpClosure: computing cutting plane closure with respect to polynomial lattice.
• Polyhedron: add integer hull computation
• IntLattice: compute lattice for a set of rational vectors
• PolynomialUtil: conversion between polynomials and vectors and utility functions for printing
• Weaksolver: propositional relaxation instead of LIA
• Nonlinear: eliminate floor, mod, div by introducing fresh variables and defining equations
• SrkSimplify: purifying expressions matching some predicate
• Syntax: generalize signature of rewriter slightly, add IsInt for lattice
• SrkZ3: parse is_int
• Interpretation: evaluate is_int