documentation
extract method to reset derived properties of a matrix
should be a test for equality, not a boolean conjunction
added lazy-loaded properties to determine whether a matrix/vector is identity or zero
invalidate derived state of matrices after non-idempotent mutations
code format
documentation
symmetric and definiteness in general should be invalidated after non-idempotent mutation
add constant for no coordinate, to supply as row/column parameter that will not be used
Merge branch 'master' of https://github.com/sixstringtheory/MaVec