Docstring tweaks; solve epydoc RST warning 'Lists must be indented.'
Resolve epydoc RST warning ' Improper paragraph indentation.'
Tweak docstrings; avoid epydoc RST warning 'Unexpected indentation.'
Tweak docstrings, fix RST bullet point lists for arguments
Fix docstring and epydoc RST warning 'Redefinition of type for fullname'
Really fix matrix.py