work work work

Now that most classes are finished to some extent, it is hard to keep track of the work I'm doing, since it is all scattered about. Today I

• fixed make install
• implemented the ustream prototype (c/f mailing list)
• removed the n % ctx syntax to construct an nmodxx 
• added nmodxx::reduce static function replacing the member functions of fmpz_polyxx and fmpq_polyxx.
• implemented fourary and fiveary expression templates
• implemented the CRT function for fmpzxx