Added matrix slicing
Removed some old code
Started moving iterators to separate module
Moved matrix iterators to separate module
Moved iterator selection to internal implementation of operations
Added by-element iterator to matrices and arrays
Added array copying
Added array comparison
Added arithmetic operations
Added operations to matrices (except "*" and "/")
Added by-row and by-column iterators for matrices
Better handling of vectors
Merge branch 'iteration' into mixout