Previously, the 'color' field in the BED track we provide for the Genome
Browser was set to the empty string, but Gerard informed us that this is not
(always) handled correctly:

   Expecting number field 5 line 2 of https://mutalyzer.nl/bed?..., got +

We now explicitely set the 'color' field to '0'.


git-svn-id: https://humgenprojects.lumc.nl/svn/mutalyzer/trunk@439 eb6bd6ab-9ccd-42b9-aceb-e2899b4a52f1