Add a meta dictionary to models.
Added PR # to the CHANGES file. Added meta as a kw argument to all polynomial classes to avoid validating it as a coefficient.
Mention the issue number, no the PR number in CHANGES [ci skip]
Remove 2to3 from documentation
Re-add cov report PY2 behavior and tone down wording against 2to3

This partially reverts commit 55c727db73e1b881d2b9fb80cae7ff93bf601b8d.
Add FixedWidthTwoLine Reader to guess list

As discussed in #3025 and #3099, it would be useful if tables that are copied
from the screen (where the defaul print format is something like)
```
col1 col2
---- ----
1.0  2.0
3.0  44.0
```
into a file could be read automatically with the guessing process.

closes #3099
closes #3025
Allow extra spaces in the fixed width marker line
Add test to allow only certain chars in postion line.
allow extra white spaces in position line
Split template into python and python parts
Add python template to setup_package.py
Add processing of python template to cython_generator
Adjustment to import python wrapper...

…itself importing the cython extension
Update erfa.pyx
Commit erfa.py
Add "_" in front of erfa functions in cython wrapper
Properly deal with stat_ok
Fix `__all__` in both templates
Update to erfa.py and erfa.pyx
Fix import in erfa tests