bin/map: Fixed bug where errors table indexes could not be looked up using index_cols() because their schema was not in the search_path, by explicitly adding the in_schema at the end of the search_path. This is the only reason the in_schema needs to be in the search_path, but it's unavoidable because the "duplicate key value violates unique constraint" error does not included the constraint's schema.

sql.py: run_query(): DuplicateKeyException: Don't parse table name out of constraint name because it isn't used and can't reliably be determined for table names containing "_"

mappings/VegX-VegBIEN.stems.csv: Reattached location.datasource_id :[] mappings directly to the location itself, rather than to the location via the locationevent

mappings/VegX-VegBIEN.stems.csv: Mapped to taxonoccurrence.sourceaccessioncode to avoid underconstraining taxonoccurrence

xml_func.py: process(): Merge mergeable siblings recursively so that newly-mergeable children are also merged

xml_dom.py: Removed no longer used merge_same_name()

xml_func.py: process(): Recombining pieces of nodes that were split apart in the mappings: Only combine nodes that are explicitly marked as mergeable, to avoid unwanted merges. Refactored to use new xml_dom.merge_by_name().

mappings/VegX-VegBIEN.stems.csv: Marked aggregateoccurrence as mergeable, in preparation for switching to explicit merging only to avoid unwanted merges

xml_dom.py: Moved merge_adjacent() recursion and name checking into merge() so that other callers of merge() can take advantage of it, too. Added merge_by_name() and use it in merge_same_name(). Removed now-unused merge_adjacent().

xpath.py: get(): Support checking all children when the elem name is '*'