improvements to boost::spirit::hold_any any.hpp file.  deleted commented dead code from prev patch. Added missing assignment operator. added overload constructor to allow c strings to be stored.
improvements to boost::spirit::hold_any any.hpp file.  deleted commented dead code from prev patch. Added missing assignment operator. added overload constructor to allow c strings to be stored.

mbmcgarry/cyclus,rwcarlsen/cyclus,rwcarlsen/cyclus,gidden/cyclus,gidden/cyclus,hodger/cyclus,rwcarlsen/cyclus,mbmcgarry/cyclus,Baaaaam/cyclus,hodger/cyclus,hodger/cyclus,mbmcgarry/cyclus,Baaaaam/cyclus,mbmcgarry/cyclus,gidden/cyclus,hodger/cyclus,hodger/cyclus,rwcarlsen/cyclus,Baaaaam/cyclus,gidden/cyclus