Simulate TOA flags

[abhisrkckl]

The infrastructure for doing this is already there in pint.toa and is straightforward to use. This PR just uses that in pint.simulation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c2c9434) 68.40% compared to head (d5c99e6) 68.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1682      +/-   ##
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+ Coverage   68.40%   68.42%   +0.02%     
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  Files         104      104              
  Lines       24336    24336              
  Branches     4345     4345              
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+ Hits        16646    16652       +6     
+ Misses       6603     6598       -5     
+ Partials     1087     1086       -1     

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[dlakaplan]

This is fine, but is it needed? You can just modify the TOAs after creation like:
t['be']='GUPPI'
(from your test).

[abhisrkckl]

Not strictly needed, but I think this will be a nice thing to have in terms of convenience.

[dlakaplan]

Maybe an addition to the docs explaining some of the flag access methods would be more useful. but I guess if you want to keep this too then it''s fine and I can merge it.

[abhisrkckl]

Maybe an addition to the docs explaining some of the flag access methods would be more useful.

I agree. I can add that in a later PR.

This one is ready to merge.