Inconsistent stream operators #165

Found this while working on the fix in #156

There are 2 levels of preprocessor macros used for the stream operators of generators and distributions:

1. BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR / BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR
   Replacement using static print/read functions for BOOST_MSVC, <= 1310 and SUNPRO_CC
2. BOOST_RANDOM_NO_STREAM_OPERATORS: Disable stream operators when BOOST_NO_OPERATORS_IN_NAMESPACE || BOOST_NO_MEMBER_TEMPLATE_FRIENDS

However they are used very inconsistently.

I can offer to fix this but would need a decision first:

1. Get rid of all those macros replacing them by standard operator<< where used
2. Use them where not used yet
   2b. Then use BOOST_RANDOM_NO_STREAM_OPERATORS to turn those macros into static print & read functions, as current just without the operators instead of having to check for this macro in each case.