[Xastir] rtree purge

[William McKeehan]

I have found that the rtree stuff makes map redraw much faster on the machines
that I use while consuming a minimal amount of additional memory.

I often leave the machine alone for over an hour, then go back to it and begin
to move around. When I wait, it takes forever the first time the maps redraw.

So I thought I would change the code to leave the rtree indexes stuff around
forever. I found the line:

purge_shp_hash();

in main.c and thought that commenting it out would give me the results that I
wanted, but it still appears to purge old indexes.

Is there an easy way that I can modify the code to make rtree leave it's
indexes around?

-- 
William McKeehan
KI4HDU
Internet: mckeehan at mckeehan.homeip.net
http://mckeehan.homeip.net