Merge branch 'cleanup' into 'master'

src/low_fibonacci.c

src/low_flat.c

src/low_greedy.c

src/low_greedy1p.c

src/mtxtree.c

src/queue.c

src/svd.c

src/systolic.c

src/treedraw.c

src/treewalk.c

testings/CMakeLists.txt

testings/draw_hqr.c

testings/draw_systolic.c

testings/testing_hqr.c

testings/testing_systolic.c

testings/testing_tileinit.c