clean up symmetrization further. specify symmetry step in units of x now
documentation for simple use case, images and example files
info label for fits, still missing: equation, units!
give fit parameters meaning and 'units'
groundworks for reconstructing data operations. decoupled and made dataobject more reusable
added export to ascii functionality for single curves
adapt documentation to reflect UI changes and export improvements
documentation: add links, compile to HTML, fix up license