 Wrote a whole host of default pmc methods.
 Wrote a whole host of default pmc methods.

 set_* create appropriate Perl* result.
 get_* simply grabs needed bit of cache.*_val

 Other methods do the rightest thing I can think of, at the moment.

 None yet cope with overflow, the modulus operation needs to be checked as
I don't know quite which semantics we really want.

Not tested yet.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@694 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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