Pyodesys

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- Copy pyx to cache dir prior to cythonize

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- Address ``indep`` by name
- Bumpy AnyODE

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- Support for max_invariant_violations
- Expose special settings
- Fix dropping units

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- Fix bug in PartiallySolvedSystem when passing linear_invariants to constructor.

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- New function ``core.integrate_chained`` for use with TransformedSys.
- Calls to ``f(x, y[:], p[:])`` now carries y0 in p[np:np+ny] (also applies to jac, etc.)
- Renamed OdeSys to ODESys (OdeSys left as a deprecated alias)
- New arguments to ODESys: dep_by_name, par_by_name, param_names, latex_names, latex_param_names
- New kwargs: first_step_{cb,expr,factory} in ODESys, SymbolicSys & SymbolicSys.from_callback respectively.
- SymbolicSys.jacobian_singular() returns bool (uses cse and LUdecomposition raising ValueError)
- New module: .results

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- Generate (multi-threaded) C++ code (against pyodeint, pycvodes, pygslodeiv2)
- OdeSys.internal_* -> OdeSys._internal