lapack.cpp now works completely with dmat row major order.

Also, norm(Matrix) now works over ARingRRR.
Added tests for dmat linear algebra, part 1.

Debugging print statements remain. linear algebra for ffpack is not
re-working yet after the change to row-major order.  But flint is
about 2/3 working.
Added tests for inverse of a matrix
ffpack and flint code now (mostly?) works with row-major order.

A number of tests have been added to EngineTests too.
added norm for mutable matrices over RRR, CCC.  Same with clean.

Except: clean of MutableMatrix isn't yet working.
Fixed typo bug in MutableMatrix::clean
lapack and mat-linalg compiles for RR/CC and RRR/CCC
lapack tests work up to eigenvectors