Test: expand CPNumberFormatter test to be more complete.
Test: expand CPNumberFormatter test to be more complete.

- Cover the formatting of @"" to nil.
- Check error messages by reference.
- Check output values.
- use @ref() instead of hand coded AT_REF.

Refs #1829.

krodelin/cappuccino,mrcarlberg/cappuccino,Dogild/cappuccino,Dogild/cappuccino,tancred/cappuccino,rgv151/cappuccino,krodelin/cappuccino,cacaodev/cappuccino,cappuccino/cappuccino,primalmotion/cappuccino,zittix/cappuccino,FrankReh/cappuccino,zittix/cappuccino,wangshijin/cappuccino,deltaprojects/cappuccino,daboe01/cappuccino,kidaa/cappuccino,primalmotion/cappuccino,wangshijin/cappuccino,daboe01/cappuccino,tancred/cappuccino,koamac/Cappuccino,mrcarlberg/cappuccino,koamac/Cappuccino,enquora/cappuccino,mrcarlberg/cappuccino,Rosch/cappuccino,tancred/cappuccino,deltaprojects/cappuccino,koamac/Cappuccino,tancred/cappuccino,cacaodev/cappuccino,kidaa/cappuccino,Rosch/cappuccino,mrcarlberg/cappuccino,AlexanderMazaletskiy/cappuccino,AlexanderMazaletskiy/cappuccino,rgv151/cappuccino,rgv151/cappuccino,AlexanderMazaletskiy/cappuccino,Dogild/cappuccino,rgv151/cappuccino,FrankReh/cappuccino,krodelin/cappuccino,daboe01/cappuccino,daboe01/cappuccino,mrcarlberg/cappuccino,primalmotion/cappuccino,cappuccino/cappuccino,tancred/cappuccino,Rosch/cappuccino,mrcarlberg/cappuccino,primalmotion/cappuccino,enquora/cappuccino,Dogild/cappuccino,cappuccino/cappuccino,deltaprojects/cappuccino,cappuccino/cappuccino,wangshijin/cappuccino,mrcarlberg/cappuccino,enquora/cappuccino,FrankReh/cappuccino,Rosch/cappuccino,wangshijin/cappuccino,cacaodev/cappuccino,zittix/cappuccino,mrcarlberg/cappuccino,Dogild/cappuccino,FrankReh/cappuccino,krodelin/cappuccino,koamac/Cappuccino,koamac/Cappuccino,kidaa/cappuccino,daboe01/cappuccino,primalmotion/cappuccino,cappuccino/cappuccino,enquora/cappuccino,cappuccino/cappuccino,AlexanderMazaletskiy/cappuccino,deltaprojects/cappuccino,wangshijin/cappuccino,zittix/cappuccino,Rosch/cappuccino,FrankReh/cappuccino,rgv151/cappuccino,cappuccino/cappuccino,primalmotion/cappuccino,rgv151/cappuccino,cacaodev/cappuccino,tancred/cappuccino,Rosch/cappuccino,AlexanderMazaletskiy/cappuccino,deltaprojects/cappuccino,rgv151/cappuccino,krodelin/cappuccino,daboe01/cappuccino,FrankReh/cappuccino,krodelin/cappuccino,Dogild/cappuccino,krodelin/cappuccino,wangshijin/cappuccino,enquora/cappuccino,kidaa/cappuccino,zittix/cappuccino,enquora/cappuccino,AlexanderMazaletskiy/cappuccino,enquora/cappuccino,deltaprojects/cappuccino,Dogild/cappuccino,deltaprojects/cappuccino,koamac/Cappuccino,zittix/cappuccino,cacaodev/cappuccino,Rosch/cappuccino,cacaodev/cappuccino,FrankReh/cappuccino,FrankReh/cappuccino,daboe01/cappuccino,kidaa/cappuccino,primalmotion/cappuccino,cacaodev/cappuccino,kidaa/cappuccino,zittix/cappuccino