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* Simplify: add two (term collection) noncommutative context std. rules These additions permit the valid application of rules to exprs including: - For new rule 'vd + n*vd -> (1+n)*vd' 'a+2*a' -> '(1+2)*a' - And new rule 'cd + cd*n -> cd*(1+n)' '4+4*b' -> '4*(1+b)' * Simplify: add non-commutative context term factoring rule 'n^n1 * n -> n^(n1+1)' Also updates extant NC-context simplify tests which now apply this rule successfully * Add and restructure non-default context simplify tests In addition to refactoring and splitting current tests into describe/it blocks, also adds test block: 'should still validly apply (term factoring and collection) rules' For ensuring simplify rules marked with 'context.[add/multiply].commutative: false' apply; simultaneously validating that simplifications still occur as expected in these contexts. Co-authored-by: Jos de Jong <wjosdejong@gmail.com>