mv load_alt_slice_gff.pl to load_alt_splice_gff.pl

Added sanity check to _objs_from_sth to allow fetching DnaAlignFeatures without a slice, so that we can retrieve userdata features for the entire genome

Added calls to allow web code to fetch an individual marker, so we can show low map weight markers on Location/View

Folded some older comments for readability.

fixed the various methods routines. this was not working at all but no one ever used it so was never noticed. Needed now for uniprot swissport having a different percentage cutoff

Add "_synonym" to database name for cross reference lines that are generated from external_synonyms (previously they were indistinguishable).

Note that Uniprot, EMBL etc are still "merged" so that Uniprot/SWISSPROT and Uniprot/TREMBL become Uniprot.

Also fixed bug that was causing EntrezGene to be changed to ENSEMBLGene