Update Genoverse so that it uses grch38
GRCh37 to GRCh38 in Genoverse and docs
Do not display karyotype for non-chromosomal regions like scaffolds etc
Accept toplevel location names in the API
Construct external urls to specific Ensembl divisions
Indicate which xref is displayed in the genome browser
More concise display of sequence composition statistics
Resize all genoverse tracks manually so that empty tracks are not collapsed
Minor help text change
Prioritize xrefs with genomic coordinates in the xref list
Add a help page for genomic mapping listing the annotated species
Fix for RFAM entries that were not displayed in the xref-table
Remove unused template variable
Rename the `feature` endpoint to `overlap` to be consistent with the Ensembl API renaming
Use accession.version format for RefSeq
Update RefSeq example sequences
Update gff output routines to use the new coordinate tables
Update gff3 output routines to use the new coordinate tables
Update bed output routines to use the new coordinate tables
Return genomic coordinates from ENA, Rfam, RefSeq, and RDP xrefs. Do not return other xrefs because they are derived from the ENA xrefs