Compile noninteger TR35 operands to zeroes when emitting Gettext

[akx]

See http://www.unicode.org/reports/tr35/tr35-numbers.html#Operands
See https://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html

Fixes #287

[codecov-io]

Current coverage is 88.47%

Merging #295 into master will increase coverage by +0.09% as of 8a1e889

@@            master    #295   diff @@
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  Files           23      23       
  Stmts         3626    3635     +9
  Branches         0       0       
  Methods          0       0       
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+ Hit           3205    3216    +11
  Partial          0       0       
+ Missed         421     419     -2

Review entire Coverage Diff as of 8a1e889

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[akx]

@imankulov: If you're around, could you give this a review?

[imankulov]

@akx I'm sorry for delay.

I finally managed to test it, and it works as expected! Rules for Russian and other languages involving variables other than n, can be simplified, of course, but I guess this is not the goal of this PR, and they are technically correct.

That's how Russian rule looks like, for example:

nplurals=4; plural=(((((0 == 0)) && (((n % 10) >= 2 && (n % 10) <= 4))) && (!(((n % 100) >= 12 && (n % 100) <= 14)))) ? 1 : (((((0 == 0)) && (((n % 10) == 0))) || (((0 == 0)) && (((n % 10) >= 5 && (n % 10) <= 9)))) || (((0 == 0)) && (((n % 100) >= 11 && (n % 100) <= 14)))) ? 2 : ((((0 == 0)) && (((n % 10) == 1))) && (!(((n % 100) == 11)))) ? 0 : 3)

Have nothing against merging it. Thank you for the fix!

[akx]

Great! Yeah, expression simplification is probably a little out of scope (though I have to admit it would be interesting...)

Merging this, thank you!