mappings/VegCore.htm: Regenerated from wiki. Documentation has been added on how to choose term names (https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/VegCore#Naming) and how to form globally unique ID values (https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/VegCore#Forming-IDs). Source and Specimen terms have been renamed to be self-explanatory and unambiguous (the DwC equivalents remain as synonyms). Short definitions of Source terms have been added to explain the differences between them. Source, Specimen, and Collection terms have been shortened according to the new instructions for choosing preferred term names (https://projects.nceas.ucsb.edu/nceas/projects/bien/wiki/VegCore#Naming).