[issue20046] Optimize locale aliases table

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> * the patch seems to include some unrelated changes, e.g. the
>   devanagari fixes and a few new mappings

May be. In any case I have added issue20027 as dependency. New mappings were 
added when enable UTF-8 locales in makelocalealias.py (I can split this in 
separate issue).

> * the optimize step is called twice for some reason - is this
>   intended ? if yes, please add a comment why this is done

Actually we should call it in a loop while the size of the table is decreased.

> * the patch would need some tests to make sure that the removed
>   aliases indeed still map to the correct C locale strings

Currently the makelocalealias.py is such manual test. test_locale contains 
multiple tests for different locales. I'll add several new cases.

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<http://bugs.python.org/issue20046>
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