Fix #2559: Make equivalencies work correctly with compose.
Add another compose-to-equivalencies example.
Fix tests
Fixed segfault in CParser __reduce__ method
Disabled multiprocessing for Windows tests
Warn when parallel feature is enabled on Windows
Remove useless read method in SExtractor reader.

- No need to store the output in `self.table` and return it.
- `self.cols` already exist in the parent method.
Default reader's outputter is already instantiated in reader's init.
Avoid computing the number of cols at each iteration.
Changed windows exception to an error and made tests xfail
update included erfa to v1.1.1
Add erfa version comment
Fixed minor problems with parallel keyword
Ensure that quantity operations with incompatible types give a useful TypeError
Fix typo in equivalencies.py [skip ci]
Merge pull request #2972 from larrybradley/typofix

Fix typo in equivalencies.py [skip ci]
Merge pull request #2934 from mhvk/quantity-non-number-operations

Ensure that quantity operations with incompatible types give a useful TypeError
Improve error message when ascii.read guessing fails
Merge pull request #2947 from saimn/ascii-small-things

Small enhancements for io.ascii
add changelog entry

[ci skip]