fix: validation/aggregating/plots/SALVIAS/bien3_validations_salvias_db_original.VegCore.sql: updated table names to match our renamings

bugfix: validation/aggregating/plots/SALVIAS/bien3_validations_salvias_db_original.VegCore.sql: can't double-JOIN like in MySQL (`JOIN a JOIN b ON a_conds AND b_conds`), so split double-JOIN into two JOINs w/ own ON clauses

added validation/aggregating/plots/SALVIAS/bien3_validations_salvias_db_original.VegCore.sql, modified from bien3_validations_salvias_db_original.sql using the steps at http://wiki.vegpath.org/Aggregating_validations_refactoring

validation/**: removed by=... indicators so that we don't have to add an author name every time a file is changed. the author indicator is not needed now that both Brad's and my edits are open-source.

validation/aggregating/*.by=Brad@iPlant*: placed under version control, since these are now open-source

validation/**: removed svn:ignore exclusion of iPlant-owned files, since these are now open-source

added validation/aggregating/, containing folders for Brad's scripts (the scripts themselves cannot be in the repository because they are not UCSB-owned)