Fix z-menu issue with compact BigBED tracks by properly not-joining when not desired rather than only turning borders off. Also forcing borders on when labels are displayed to avoid rendering an utterly mad pile of labels to the user.
Fix z-menu issue with compact BigBED tracks by properly not-joining when
not desired rather than only turning borders off. Also forcing borders on
when labels are displayed to avoid rendering an utterly mad pile of labels
to the user.

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode