Add getTranscriptsMapping webservice method

For use by LOVD (NGS variants import, Jerry Hoogenboom), implement the SOAP
webservice method getTranscriptsMapping. The calling signature is the same as
for the existing getTranscriptsRange method, but the new method returns more
than just the transcript names.


git-svn-id: https://humgenprojects.lumc.nl/svn/mutalyzer/trunk@451 eb6bd6ab-9ccd-42b9-aceb-e2899b4a52f1