We need resource directories, even when empty
added gene.length val
remove location fields from SNP config, they are included in the location displayer already so duplicates. Remove transcript identifier, you can only have one field in the widget display
Made sure the regionDensities endpoint checks the bin size.

This was not documented!
Merge branch 'jbrowsable' into dev
Merge branch 'dev' of github.com:intermine/intermine into dev
use organism for key because primary identifiers are duplicated for each strain
shorter test project file - 4 species
Merge branch 'dev' of github.com:intermine/intermine into dev
new source synbio-gff
Changes to deal with negative segments

JBrowse will sometimes request negative segements. These must be dealt
with sensibly.
Updated expectations
Blank extraValues are now interpreted as null.
Code gen fixes.
All Python and Java code gen tests passing.
Merge branch 'dev' of github.com:intermine/intermine into dev
add gff source for bacteria
Merge branch 'dev' of github.com:intermine/intermine into dev
gene fasta, faa -> frn
Allow chained replacements.