DOC Use autodoc_default_options dict
DOC Use autodoc_default_options dict

Closes #308 by relying on dictionary based default options
rather than ``autodoc_default_flags``.
The other deprecation warning regarding function based directive
support has been removed on my machine...
[skip ci]

CORE-GATECH-GROUP/serpent-tools,CORE-GATECH-GROUP/serpent-tools