Sympad

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* Added extended comparisons: x < y < z >= w != ...
* Added SymPy set operation Contains usage.
* Added and expanded some function visual translations: summation(), .limit(), .diff(), .integrate() and more...
* Added compacting of multiple Subs() and .subs().
* Changed lambdas to bind global variables on definition.
* Cleaned up passing assignments as equations into functions.
* Cleaned up internal handling of incomplete and empty matrices.
* Fixed more obscure grammar cases.

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* Added Pythonic 'or', 'and' and 'not' operators using SymPy Or, And and Not.
* Added slice() translation and lots of slice formatting fixes.
* Changed comparisons to use SymPy comparison objects first and fall back to Python operators if that fails.
* Patched in basic math operation on SymPy Booleans, x + (y > z) valid now.
* Patched SymPy sets.Complement to sympify args.
* Fixed lots of obscure corner case grammar things that should never happen anyway like dictionaries of slices.

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* Added walk over vector field plotting using matplotlib.

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* Added vector field plotting using matplotlib.

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* Added basic function plotting using matplotlib.

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* Extended post-evaluation simplification into basic Python containers.
* dict_keys, dict_values and dict_items converted to lists.
* Autocompletion of parentheses of member function calls and user lambdas.
* Added Subs() and .subs() translation and latex parsing.