add some way to mark the species certainty?

[mpitser]

one (stretch of an) idea: when a new tree is added, allow user to specify species certainty (0, 50, 100%)

• if certainty == 0%, list as unidentified, add a marker to tell users to identify please
• if certainty == 50%, add a marker to tell future users to confirm or change the species
• if certainty == 100%, don't show the species certainty input in new observations, but the user could still change the species if they wanted