Fixes a nasty bug in propagateBVHFrontListCollisionRecurse() #110
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This was causing
test_fcl_frontlist
to seg fault on Windows. The bug is platform independent though so it definitely wasn't working right anywhere. Windows happened to access unreadable memory; probably it picked up garbage elsewhere. Apparently the test case isn't too fussy!Also did some minor code cleanup (std::fabs -> std::abs, fix a typo).
@panjia1983, do you know how the test case could be improved so that it would have noticed this?