remove recursion bugs, add dataclass context, add plural tokens parsing

Recursion bugs removed by improved rule parsing and routing, recursion exception now handled
Context improved by moving to dataclass
Compute divisor fixed by adding precision context
Plural tokens now parsed
Typos and improved comments

Author: blagasz

babel/numbers.py

@@ -28,6 +28,7 @@
 
 from babel.core import Locale, default_locale, get_global
 from babel.localedata import LocaleDataDict
+from babel.rbnf import RuleBasedNumberFormat
 
 LC_MONETARY = default_locale(('LC_MONETARY', 'LC_NUMERIC'))
 LC_NUMERIC = default_locale('LC_NUMERIC')