added a new track for balancers

* this feature won't be available for testing until WS245 has been
  staged and the GBrowse configuration files built.
* See also related commits to the staging code in the admin repo
* Probably also requires changes to the Rearrangment summary, not yet specified.
added a new track for balancers

* as described in #1717
* this feature won't be available for testing until WS245 has been
  staged and the GBrowse configuration files built.
* See also related commits to the staging code in the admin repo
* Probably also requires changes to the Rearrangment summary, not yet specified.
Merge branch 'ws245_rearrangements' of github.com:WormBase/website into ws245_rearrangements
Quick stab at adding configuration for new tandem_duplication tracks as discussed in #2852

* This will not be testable until 245 is staged and config files built.
field name change of nematode ortholog #2973
Update external_urls

EG search URL changed
fix labels for transposon genes / pseudogenes

* #3104
restore orfeome fgcolor that was previously handled by subroutine

* closes #3164
Update external_urls

updated to the new SGD urls 
resolves #3167
add sequence ontology site urls 3161
change display of various widgets in Feature page #3161
modified Overview and Association widget
added Evidence widget
modify and use shared History widget
fix sequence tag2link mistakenly markup Ace class transcription_factor #3161
Merge branch 'staging' into 245-seq-feature
Merge branch '245-seq-feature' into staging
include associations and location widgets in default widget of Feature #3161
add associated gene field #3161
vertical-align:middle for field-content and field title in highlight box
Merge branch 'staging' into 245-seq-feature
Merge branch '245-seq-feature' into staging
test case for associations of sequence feature #3161