Change synthesis.py to numpydoc style

[KybernetikJo]

This PR refactors the Slycot/slycot/synthesis.py in order to be closer to the numpydoc style as discussed in #100.
Should be part of #204.

Remark:
The synthesis.py has already been quite close to numpydoc before this PR. There must have been major cleanups in the past.

(finished 18 of 18 = (17 + 1) routines)

Routine name	Finished	Status description
sb01bd		*3
sb02md		*3
sb02mt		*3
sb02od		*3
sb03md		*3
sb03md57		*3
sb03od		*3
sb04md		*3
sb04qd		*3
sb10ad		*3
sb10dd		*3
sb10fd		*3
sb10hd		*3
sb10jd		*3
sb10yd		*3
sg02ad		*3
sg03ad		*3
sg03bd		*3

Status description:

1. numpydoc docstring sections, fixed
2. parameters data types, fixed and 1 fixed
3. optional and default values, fixed and 2 fixed

[KybernetikJo]

The test coverage drops, because the routine sb10jd has been added to init.py, but there is no pytest for it.

[bnavigator]

The test coverage drops, because the routine sb10jd has been added to init.py, but there is no pytest for it.

It's actually because of the removal of the last :info = -i: from the docstrings:

The following block is not covered properly.

Slycot/slycot/exceptions.py

Lines 104 to 114 in 5b65877

	if infospec == "info = -i":
	if 'i' not in checkvars.keys():
	continue
	infospec_ = infospec.replace(" = ", " == ")
	try:
	info_eval = eval(infospec_, checkvars)
	except NameError:
	raise RuntimeError("Unknown variable in infospec: "
	+ infospec)
	except SyntaxError:
	raise RuntimeError("Invalid infospec: " + infospec)

This is outside of the scope of this PR.

[bnavigator]

Thanks a lot @KybernetikJo!