check-code: disallow defunct <> operator
Added a test for that and one other python3 check in
test-check-code.t.
largefiles: stop using <> operator in favor of !=
<> has been deprecated for a while, and != is futureproof
check-code: disallow two-argument form of raise
Using this old form makes any attempt to port to Python 3 harder, and
the new syntax is supported in 2.4 already.
httpclient: apply change
df9aea1def3e: remove use of two-argument raise
test-symlink-os-yes-fs-no.py: clean up use of two-argument raise
This makes any attempt to port to Python 3 harder, and the new syntax
is supported in 2.4 already.