Renamed 'release()' to 'commit()'
Merge branch 'master' of github.com:mleise/sequencer
Replaced declaration of getpagesize() with a version from druntime.
First step to aborting running algorithms: Threads have a user (reference) count.
The first increment starts the thread, the last decrement joins it automatically.
Ranges like the line splitter add/remove themselves from this count in their ctors/dtors and post blit.
Unfortunately this system adds a management overhead of 5% to the benchmark and exposes a code gen bug causing a massive slowdown in the GCC backends prior to 4.8.0.