schemas/vegbien.sql: taxonpath: descriptive comment: Changed "applicable taxon" to "identified taxon"

schemas/vegbien.sql: taxon: descriptive comment: Reworded to emphasize that this stores only one rank (e.g. family) of the full taxonomic name, in contrast to taxonpath, which stores all of them

schemas/vegbien.sql: taxonpath: descriptive comment: Clarified that this is the full path to a taxon, including all components of the taxonomic name

schemas/vegbien.sql: Replaced "scientific name" with "taxonomic name" for schema-wide consistency and for consistency with the taxon/taxonomic name vocabulary

schemas/vegbien.sql: taxonpath named ranks: Added descriptive comments for data dictionary

schemas/vegbien.sql: taxonpath columns other than named ranks: Added descriptive comments for data dictionary

schemas/vegbien.sql: taxonscope: descriptive comment: Reworded to make the first sentence a noun, for consistency with other descriptive table comments

schemas/vegbien.sql: taxon: descriptive comment: Added note that the taxonname stores only one rank (e.g. family) of the full identifying name

schemas/vegbien.sql: taxonpath: descriptive comment: Reworded to make the first sentence a noun, for consistency with other descriptive table comments. The convention is for the first "sentence" to be a noun which describes the entity that the table models.

schemas/vegbien.sql: comments: Removed units from comments on fields which already have a units suffix, to avoid having to keep the units in sync between the suffix and the comment. Note that the units were abbreviated equally in the suffixes and comments, so this did not result in a loss of information other than the ^ for a quantity squared (but it's obvious enough that m2 is m^2).