added main cases that tracking needs
added special_search function to bump the particle slightly and thens earch
through all volumes to find volume xyz is in
prototype for special_search
removed lines that change the value of retstep and propstep
included comments regarding std::cout and errors in functions
Merge pull request #81 from svalinn/code_only_g1fix

I am performing my first merge, smoke me a kipper, Ill be back for breakfast.