Scilab2py

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- Add `convert_to_float` property that is True by default.
- Suppress output in dynamic function calls (using ';')

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- Make `eval` output match Octave session output.
If verbose=True, print all Octave output.
Return the last "ans" from Octave, if available.
If you need the response, use `return_both` to get the
`(resp, ans)` pair back
- As a result of the previous, Syntax Errors in Scilab code
will now result in a closed session.
- Fix sizing of plots when in inline mode.
- Numerous corner case bug fixes.

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- Add suppport for Scilab 5.4

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- Allow keyword arguments in functions: `scilab.plot([1,2,3], linewidth=2))`
These are translated to ("prop", value) arguments to the function.
- Add option to show plotting gui with `-g` flag in ScilabMagic.
- Add ability to specify the Scilab executable as a keyword argument to
the Scilab2Py object.
- Add specifications for plot saving instead of displaying plots to `eval` and
dynamic functions.

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- Streamline API to mirror Oct2Py 2.0.0
- Python 3 support
- Bug fixes and usability improvements.

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- Initial Release