Added test cases. Get install directory from a environmental varible.
birth profile cdf file is too large for github so dont make one.
Merge pull request #8 from D3DEnergetic/development

Add test cases. This involved having fidasim.f90 read the install directory from an environmental variable instead of the input file. This makes it so that the user does not have to change any input files to run them. This increases portability.