moved unneeded monomial code to misc_code folder
added some comments
removed unnecessary addTerms code from polynomials.lp
changed fraction constraints on denominator
reorganizing code in eqn_solver
removed unneeded predicate (canGrowTreeFromNode)
rearranging deletion code
added some comment headers
removed group rule (placed in code scraps); not really used
added some comments
simplified numerator generation in addSameFrac
changed addSameFrac to use removeFracFields
patched up definition if isZero for polynomials
changed how children are assigned to temp nodes
grouped together temp actions
simplified polynomial copying
simplifying addDiffTerms
removed unused code
modified hasTermWithDeg predicate
fix multiply polynoms bug (empty subtree issue)