Implemented (Real) Ray Tracing by Stack#2

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geogunow wants to merge 3 commits intomasterfrom

Commits on Mar 24, 2016

Updated solver to include semi-actual ray tracing by z-stack
geogunow
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Commits on Apr 7, 2016

Fixed bugs in tracking update
geogunow
committed

Commits on Apr 8, 2016

Updated absolute value for floating point
geogunow
committed