made progress on adding herbrecords using the N,S,E,W,C buttons in the
plot herb list. the herbrecords are now being added to the db when
making the icon blue, and removed from the db when making the icon gray

remaining items are:
- adding check if survey.isAbundance=true, show dialog with abundance
slider when clicking icon
- duplicate herbrecord functionality to shrub tab, with a count of
shrubs instead of abundance in the dialog
- figure out what to do for tree tab, maybe +/- buttons directly in the
species list?
- prevent duplicate species in surveyspecies & species tables