Added experimental support for specifying tracklines in Remotely attached user data (BigBED, etc). Turned off unless a flag is set in the config for now as the UI is confusing and only currently has any effect for BigBED and only partial at that (colours).
Added experimental support for specifying tracklines in Remotely attached
user data (BigBED, etc). Turned off unless a flag is set in the config
for now as the UI is confusing and only currently has any effect for
BigBED and only partial at that (colours).

Started factoring attached file format code to resemble format-per-package
layout of internal fields.

Further tidying and implementation to follow.

Underlying motivation is to get configurabiltiy into ENCODE data and to
allow colour specification eg for methylation tracks during trials.

Using style column for trackline data (otherwise unused for attach data)
is hacky: better suggestions welcome.

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