additional Expressions; diff(x,e)
Merge branch 'master' of github.com:Macaulay2/M2 into NAG
fixed the refine bugs; documentation
Merge branch 'NAG' of github.com:antonleykin/M2 into NAG

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debug flag
Merge branch 'NAG' of github.com:antonleykin/M2 into NAG
more Expressions
refine bug in bertini
SLProgram, Expression, evaluateSLP