Inital quadtree impl. queryRange and subdivide work, insert is untested.
Drawing QuadTree, square canvas, f8 hides header..
Cleanup in gravity and controls needed before merge with master.

Need to pull the non-quadtree stuff out of the QuadTree class by
subclassing it.
Fixed slidetoggle to include the footer. Added easing function to QuadTree so I can ease out the opacity.
Basically subclassed QuadTree into SquareTree.
I REALLY should be sleeping right now.
Debug drawing accurate QuadTree info.
Working and faster, but still slow. Needs lots of work before it's polished, but I'm pushing to my site here because it's pretty and functional.
Totally forgot these files two commits ago.. [5]
Somehow theta was deleted.
[6.5]
A better theta value.
Rewrote text, fixed links to GitHub.
Fixed some code and text typos.
Inital OSM map work that was done on live site.
Final edits and tweaks for a while, going to work on OSM and session stuff on openstreetmaps branch.
Merge remote-tracking branch 'origin/openstreetmaps' into barneshut
Actually I'll keep working in this branch for a while.
Damn -a flag.
Fixes to _session_vars, changes to /canvas/gravity and /map.

/canvas/gravity now accepts a URL query for number of particles.

gammalib now has a function for getting URL parameters by name.

Fullscreen when pressing F10 now works properly, and the settings stays saved.

OpenStreetMap settings stay saved as well.