Add sanity check for Python version
python.org started issuing redirects to https

Update our link and add -L so we can follow future URL changes.
[PTFM-12132] Use action=append instead of nargs=*
PTFM-11918 Support 503/Retry-After in dxcpp.
Check return value of tmpnam
List the token timeout and configuration information in dx login
Changelog and version updates for v0.102.0, UA 1.5.4