Added miscellaneous tests.
Remarkable: For the given parameter-values (with small x) the outputs of the executables from ErrorEstimationBalakotaiahSinusTest.cpp and ErrorEstimationBalakotaiahSinusTESTSPLINESsimple.cpp differ very much in contrast to the outputs for x=y=0.005 (other parameters unchanged).
Some conceptual changes to ErrorEstimationBalakotaiahSinusTESTSPLINESFileInput.cpp. In this context: Added CreateRawDataFilesForSplines.cpp.
Futher improvements...
Increased precision of data-output files up to 16 relevant numbers. The two  codes "ErrorEstimationBalakotaiahSINUSTESTSPLINESsimple.cpp" and "ErrorEstimationBalakotaiahSINUSTESTSPLINESFileInput" now yield, in the sense of a sufficient precision,  the same results. At least for the chosen parameter-values.
Removed superfluous comments.
Made some changes about tests in order to compare the results of the spline-error-calculation ("ErrorEstimationBalakotaiahSinusTESTSPLINESFileInput.cpp") and the quasi-analytical one ("ErrorEstimationBalaoktaiahSinusTEST.cpp").
Set  phase-velocity to a more reasonable value, that has been calculated for Liangs reference-data before (cf. folder GetPhaseVelocity).
Corrected some separators in Makefile.
Fixed Makefile!?!?
Updated JanALE.json. "Wavehill" (and diffusion within it) should be observable in its motion (development) over approx. 40 wavelenghts.
Clean up 1. Removed some superfluous files and accordingly adapted code.
Added README-files in the raw-data folders "hrawdata" and "qrawdata". These files also have a "tagging-function"for the folders, that usually contain a large number of variable data files.