Inconsistent stream operators

Found this while working on the fix in https://github.com/boostorg/random/pull/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.

Review the generator and distribution stream-operator implementations, the BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR and BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR macros, and PR #156. First resolve whether the macros should be removed, applied consistently, or combined with BOOST_RANDOM_NO_STREAM_OPERATORS. Done means the chosen policy is applied consistently across the affected operators.

Written by the indexing model from the issue text.