Widget: fixed a bag always displaying the checkbox 'Normalise by length'
checked.(the attribute gene_length_correction is now a boolean)
Widgets: fixed a bug adding in the built query more tables than that
needed.
E.g. enrich=goAnnotation.ontologyTerm[GoTerm].parents.name and
enrichIdentifier=goAnnotation.ontologyTerm.parents.identifier.
The built query contains in join only the class GOTerm referring to both
attributes ontologyTerm and not 2 classes: GoTerm (for the ontologyTerm
in enrich field) and OntologyTerm (for the ontologyTerm in
enrichIdentifier field) 
Merge branch 'dev' of github.com:intermine/intermine into dev