Implemented efficient Sparsity::append for vectors, #993
Refactored Sparsity::append, Sparsity::appendColumns, #993
Implemented more efficient Matrix::append for vectors, #993
Refactored vertcat, horzcat for sparsity patterns, #993 #554
Added vertsplit, horzsplit for sparsity patterns #993
Refactored Horzsplit, #993
Refactored Split, #993
Implemented Vertcat, Vertsplit for vectors #993
Activated Vertcat, Vertsplit for vectors, #993
Updated shallow_water benchmark, #554