This brings the code to upstream commit 3ece3d6 (I've made my own Rockbox-
specific changes on top of that).

Changes include using C99 `bool' throughout, and minor logic fixes for some
puzzles.

Change-Id: Ie823e73ae49a8ee1de411d6d406df2ba835af541

This brings the source to upstream commit 506b073 (though I have made some
extra commits on top of that). Notably this includes a fix for a double-free
bug that I myself introduced upstream.

Change-Id: I02671586bbc34d63e05398ee971271fed42538cf

This brings the upstream version to b3da238 (though some of my own
changes are included on top of that).

Change-Id: Ida73e8cd86765413147ce891af3cc2b7aeda2b2a

There have been some improvements with regard to small screen sizes,
which will be nice to have.

Change-Id: I30c740514156258d2818fde325c1a751500f7611

This brings puzzles to upstream commit 84d3fd2.

Change-Id: I808a197f868032d771fc101a15666c5ec4b9f94b

This brings puzzles up-to-date with Simon's tree, along with the
rockbox-specific changes I made. Note that I also got rid of some
of the ugly floating-point code in rbwrappers.c and replaced it
with wrappers for our fixed-point library.

Change-Id: Ibfb79acb15517116a26de1c3ea89e025146b9e2e

This brings puzzles up-to-date with upstream revision
2d333750272c3967cfd5cd3677572cddeaad5932, though certain changes made
by me, including cursor-only Untangle and some compilation fixes
remain. Upstream code has been moved to its separate subdirectory and
future syncs can be done by simply copying over the new sources.

Change-Id: Ia6506ca5f78c3627165ea6791d38db414ace0804