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Further optimize the implementation of Hermite Normal Form in Sage
PEOPLE: Clement Pernet, William Stein
SUMMARY: Do the following:
- Rewrite add row to (a) use a block method, and (b) use fast non-recursive code (it is silly right now).
Implement (or wrap?) Clement's "twice as fast" double det. ---> done(cpernet 03/01/08), still need some tune-up.
Improve LinBox rational solver: efficiency with small size entries, endianness issue making it brake on solaris;
- Wrap it in sage
- Validate linbox-1.1.5rc1.spkg and givaro-3.2.10.spkg for sage-2.10.3