Sympad

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* Changed function keyword argument recognition to be more friendly to equations.
* Added automatic post-evaluation simplification (optional through env).
* Added SymPy matrix multiplication intermediate simplification patch to control matrix expression blowup (optional through env).
* Union of symmetric Complement sets converted back to symmetric difference after evaluation where applicable.

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* Changed native vector and matrix representation from {} to \[] to make grammatical room for sets and dictionaries.
* Added basic sets and operations.
* Added Python dictionaries.
* Added LaTeX \Re and \Im functions and translation.
* Integral now concatenates iterated integrals into one function call.