Fixed #22335 -- Fixed popen_wrapper error on non-English Windows systems.
Merge pull request #2481 from zsiciarz/ticket-22335

Fixed #22335 -- Fixed popen_wrapper error on non-English Windows systems.
Fixed Python 3.4 test failure.
Fixed #22029 -- Removed obsolete advice on registering migrate/syncdb signal handlers.

All signals should now be registered in AppConfig.ready().

Thanks un33k for the report.
Fixed the PostGIS circular imports caused by 1506c71a95.

Thanks to @loic for the help and @timgraham for the review.

refs #12030.
Fixed #22114 -- Stopped adding trailing slashes in URLField.to_python

Thanks coredumperror at gmail.com for the report and Tim Graham
for the review.
Forgotten slash removal in d320863878