Allow an optional apostrophe after common nouns.

        This allows analysis of compound proper names when they are
        not tokenized as a single token (see the manual for details).
Relax tests for different decimal/thousand separators.
More Unicode apostrophe symbols.
Exceptions with pronouns 'biri' and 'birisi'.
Add "silent phonemes" to roman numerals.
Move '-mI without space' option to options.h.