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
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]
Merge pull request #2971 from eteq/erfa-v1.1.1

Update to ERFA v1.1.1
Regression tests against #2083 (rounding issues near leap seconds)
Merge pull request #2978 from mhvk/time-leap-seconds-check

Regression tests against #2083 (rounding issues near leap seconds)
Change __repr__ of coordinates to seperate data and frame attributes
Add coordinate __repr__ change to CHANGES.rst
Update coordinate frame doc with different coordinate  repr
Note coordinate repr changes in two places in CHANGES.rst

[ci skip]