py_codegen: Fix deprecated use of imp module.

See merge request inducer/pytools!30

Also, this changes an error message to use an '%r' format string for
reporting the bytecode version magic, to avoid printing unreadable
characters.

Tools for memory usage debugging

See merge request !29

EOCRecorder: pretty print formatting

See merge request !28

ProcessLogger: avoid spawning threads in noninteractive environments...

See merge request !27

ProcessLogger: avoid spawning threads in noninteractive environments (https://github.com/firedrakeproject/firedrake/issues/1422)

Improve pdict error printing (closes #6 on gitlab)

Closes #6

See merge request !26

Add, document the constant SUPPORTS_PROCESS_TIME.

Closes #5

See merge request !25

Closes #5

Pylint: Switch to YAML-based config, fix failures

Closes #4

See merge request !24

See also: ci-support!17

Cache hash value of ImmutableRecord

See merge request !23

Due to the data structure to being intended immutable, the hash value
cannot change during object lifetime. This commit caches the value
upon first evaluation.

Avoid using specific Py3 sub-versions for CI

See merge request !22

Run pylint in CI

See merge request !17

CI: Drop Py35, add Py36

See merge request !21

Fix Py3.7 deprecation

See merge request !20

Placate flake8 3.6

See merge request !19