Log message:
Follow redirects in MASTER_SITEs and HOMEPAGEs.

Log message:
Get the package to build properly. Require a Python package be installed
(this was the reason the bulk-build failed). Also sort out a number of problems
with different Python versions being installed on the same system.

Log message:
This is an expanded version of the Python debugger, pdb.py

It largely tries to follow gdb's command set unless there's good
reason not to. So new or modified command names generally refer to the
function they have in gdb.