schemas/VegCore/VegCore.ERD.mwb: taxon_observation: allow any taxon_observation to link directly to a taxa_sampling_event, not just aggregate_observation. this allows any taxon_observation's methodology information to be found directly by joining to taxa_sampling_event. previously, one had to join to event.parent and then taxa_sampling_event, and it was not clear that event.parent would even be a taxa_sampling_event.

schemas/VegCore/VegCore.ERD.mwb: aggregate_observation: link to rather than being a taxa_sampling_event, because taxa_sampling_event was actually intended to be the container event in which various types of taxon_observations occur, rather than a type of taxon_observation itself. rearranged tables to avoid them covering any lines.

schemas/VegCore/VegCore.ERD.mwb: renamed GNRS & geovalidation steps to just geoscrubbing steps for clarity

schemas/VegCore/VegCore.ERD.mwb: taxon_occurrence: added within_place to allow easily locating all the taxon_occurrences in a plot. (some taxon_occurrences require within_place, but there was no common superclass field to allow joining to just a single table.)

schemas/VegCore/ERD/VegCore.ERD.png.map.htm: moved reobservable tables (individual, specimen, etc.) before aggregate_observation tables because these are less abstract

schemas/VegCore/VegCore.ERD.mwb: regenerated exports and udpated image map

schemas/VegCore/VegCore.ERD.mwb: individual_count: inherit from taxon_presence because this is also a type of taxon_observation (and specifically, a taxon_presence), in addition to the general taxon_presence it's associated with. it is possible e.g. for different diameter classes to be counted by different collectors, and thus to need separate taxon_observations to store the different collectors.

schemas/VegCore/VegCore.ERD.mwb: added taxon_occurrence to store the underlying occurrence for each taxon_observation. we cannot use reobservable for this because not all taxon_observations are reobservable, but the one-time observations still have an associated occurrence. moved reobservable.current_determination to taxon_occurrence and renamed it to current_observation (this can be used to find the latest observation for each occurrence).

planning/timeline/timeline.2013.xls: added spacing between later column and weeks to make clear that dots in the later column do not correspond to a week

inputs/FIA/occurrence_all/: renamed to taxon_observation.** to clarify what an occurrence is. taxon_observation has the same meaning as in VegCore, where each taxon_determination is considered a separate taxon_observation of the associated specimen or vouchered plant (vegpath.org/VegCore/ERD/). (note that having multiple taxon_determinations only makes sense when there is something to reobserve.) the .** is SQL dotpath syntax (wiki.vegpath.org/SQL_dotpaths) for the recursive expansion of all tables to which taxon_observation has forward fkeys (i.e. "the left-join").