make transfer of experimentally verified GAF optional
make transfer of experimentally verified GAF optional

The new '-x' switch in transfer_annotations_from_gaf.lua now allows to
enable/disable the restriction to experimentally verified functional
information.

sanger-pathogens/annot-nf,fw1121/annot-nf,satta/annot-nf,sanger-pathogens/companion,satta/companion,sanger-pathogens/annot-nf,satta/companion,satta/annot-nf,satta/annot-nf,sanger-pathogens/annot-nf,fw1121/annot-nf,sanger-pathogens/companion,satta/companion,fw1121/annot-nf,sanger-pathogens/companion