[SoC] H2-OJ integration

[Christopher]

This week I started laying out a spatial index built upon JTS's R-tree within H2.

The biggest problems I had was that H2-spatial is basically a fork of H2 and the only source tree I can find of H2-spatial doesn't have a full build script. This led to many manhours being spent having fun with compilers and IDEs rather than coding.

Next week I hope to have my own build of H2+spatial+R-tree working, or at least in the debugging phase.

--Christopher