Supply long-missing docs for random.seed().  Extensive rewrite of module intro docs. *************** Fred:  check my LaTeX!  Also, the docs for whrandom should *************** be moved into Obsolete Modules.
Supply long-missing docs for random.seed().  Extensive rewrite of module
intro docs.
*************** Fred:  check my LaTeX!  Also, the docs for whrandom should
*************** be moved into Obsolete Modules.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator