GitLab

Renamed Accumulator->Transform, since Accumulator does not make so much sense for Endomorphism

Added 'Function' and 'Accumulator' to interface, which can be used as endomorphism/univar/bivar function/accumulators.

Modifying template parameter ordering to A, B, C.

Updated examples accordingly to use these.

Switched from function pointers to std::function, and made some tests use Lambdas. There are useful things in C++11 after all.

Added tests for sparse univariate custom function that performs integration of a sparse matrix of forces based on a cutoff. It reveals limitations in the current sparse summation implementation.

Made some corrections to handling of scaling for symmetric and symmetric hollow matrices in order to supports groups (no mul op). Added is_sparse to vector and matrix interfaces. Started work on getting rid of is_ord tempalte parameter for tensors.

Got univariate functions working, added some two tests for them, including force integration. Added a function to compute the additive inverse of a tensor to be used for groups, as the normal infrastructure cannot currently handle this case, since it uses the notion of an inverse of the multiplicative identity