Namespace simplify flags

[benjeffery]

Part of #1720

[jeromekelleher]

LGTM

[codecov]

Codecov Report

Merging #2226 (1564d8a) into main (23fd277) will increase coverage by 0.00%.
The diff coverage is 91.66%.

@@           Coverage Diff           @@
##             main    #2226   +/-   ##
=======================================
  Coverage   93.29%   93.29%           
=======================================
  Files          27       27           
  Lines       25992    25994    +2     
  Branches     1165     1165           
=======================================
+ Hits        24249    24251    +2     
  Misses       1713     1713           
  Partials       30       30           

Flag	Coverage Δ
c-tests	92.20% <100.00%> (+<0.01%)	⬆️
lwt-tests	89.05% <ø> (ø)
python-c-tests	72.06% <71.42%> (ø)
python-tests	98.87% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/_tskitmodule.c	90.96% <71.42%> (ø)
c/tskit/tables.c	90.28% <100.00%> (+<0.01%)	⬆️

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