Test concept
Stencil test cases
Rename recursive merge algorithm
Make merge_recursive static
Add binary search based merge
Build, test and bench the binary search based merge
Fix bug in datapara
Remove example main file
Add note about bucket algorithm
Bench binary search merge too
Simplify bucket sort algorithm
Add unit for sequential processing
Use actual thread number in benchmarks

Up until now we used the one given on cmdline in the outputs, which
doesn't work in the default case (0).
Stencil bench and initial MPI scaffolding
Fix seq unit in recursive merge
Additional rough stencil function structure
Extend matrix library with submatrix functions
Implement most of the parallel stencil iteration
Perform the actual sequential stencil
Merge altered submatrices