Fix a warning/compile error.
Slightly less memory errors

Using more std::vector and less memcpy/memset etc.
Still seems to have issues but not segfaulting as much.

Fixed m_sign missing in = operator
Improved "realops" tester

And there are signs of serious problems in Arbint too!
Merge branch 'master' of git.ucc.asn.au:/ipdf/code

Dammit I forgot to `git stash; git pull; git stash apply`
More testing particularly of negatives