One more fit example covered by functional tests. BROKEN: unexpected behavior of almost_equal needs to be investigated.

PyPersistTest now compares dat and ref YAML tree entry by entry, allowing for a tolerance for floating-point numbers.
Still to do:
- allow for "VARIABILITY" anywhere in the tree
- generate YAML output from Fit tests.

Correct decomposition of paths in PyPersistenceTest to allow for directories that contain a dot. This resolves #1583.

Meaningful persistence tests in place for all Example/python/simulation, except for SpecularSimulation.py which only writes a trivial text line. This resolves much of #1440.

This is, however, no good solution because one test may write several intensity maps with different reproducibility levels.

IntensityDataFunctions::getRelativeDifference has now same implementation for IHistogram and for OutputData<double>.

Persistence test now able to read multiple data and reference files; detects missing data and reference files.

We do not want a sys.path=... command in each example. Therefore in PyPersistenceTest the system call of Python must be preceded by a setting of PYTHONPATH.

Resolving #1440: CMake part done. C++ part half done. Still TODO: (C++) compare with reference (Py) modify all examples

PyCoreTest now writes concise log lines, and by some miracle Python errors also appear in the log. This resolves #1571, except for a possible failure to detect zero-filled detector images.

Python script, generated by ExportToPython, now takes argument '-p' for plotting, or <output_filename>. This resolves #1573.

Merge IFunctionalTest::analyzeResults() into IFunctionalTest::runTest() [Tests are a sequence of actions, each of which may result in failure. Therefore there is no natural division between test and analysis]. Also detect errors from Python script execution commands. This partly resolves #1571.

more explicit method name "simulationToPython"; change parameter name into "simulation_output_filename" to make clear this is the output filename of the simulation, not the output filename of the export method.

prepare for refactoring Python export; simplify OrderedMap -> LabelMap, and move it to where it is used