Merge pull request #2367 from WormBase/staging

Preliminary work for WS241
* gff3 fixes
* new species (O volvulus, D immitis, P redivivus)
* various bug fixes and feature requests: 
** #292 #400 #404 #1440 #1549 #1680 #1771 #1791 #1795 #1796 #1809 #1837 #1843 #1860 #1899 #1904 #1926 #1964 #1968 #1993 #2012 #2016 #2017 #2102 #2136 #2143 #2146 #2147 #2180 #2186 #2189 #2190 #2194 #2198 #2211 #2292 #2303 #2309 #2334 #2347
Merge pull request #2395 from WormBase/staging

WS241 updates
Merge pull request #2449 from WormBase/staging

WS241 - final
Merge pull request #2465 from WormBase/staging

Final WS241 updates
Merge pull request #2472 from WormBase/staging

Staging - WS241
* gbrowse
Merge pull request #2647 from WormBase/staging

Staging
Merge pull request #2666 from WormBase/staging

Staging
Fix float issue - search box
* fix #2701
Fix search box issue
* fix #2701
Search icon - make room
* #2701
merge conflict