schemas/VegBIEN/VegBIEN data dictionary.xlsx: updated: finished populating viewFullOccurrence->analytical_stem_view and analytical_stem_view->viewFullOccurrence mappings

schemas/VegBIEN/VegBIEN data dictionary.xlsx: updated: use new deletion comments (with () ) to indicate portions of external terms whose semantic meaning does not apply to our usage

web/username_prefix.php: added support for deletion comments of the form (c_)x(_d)@url -> c_x_d@url . deletion indicates that the semantic meaning of the () portion does not apply, even though it's included in the linked term name.

web/username_prefix.php: comments: use [] instead of () because in writing, [] denotes insertion, while () (as an editing mark) denotes something to remove

web/username_prefix.php: comments: use [] instead of () because in writing, [] denotes insertion, while () (as an editing mark) denotes something to remove

schemas/VegBIEN/VegBIEN data dictionary.xlsx: updated: removed extra rows and columns so that they aren't included when copying and pasting

schemas/VegBIEN/VegBIEN data dictionary.xlsx: updated: added tab to store viewFullOccurrence->analytical_stem_view mapping

schemas/VegBIEN/VegBIEN data dictionary.xlsx: updated: added viewFullOccurrence column

bugfix: web/index.php: fixed bug where full directory index would not display correctly if invoked as /index.php instead of / (caused by incorrect URL)

schemas/VegBIEN/VegBIEN data dictionary.xlsx: updated: added links to editable and clickable versions of the spreadsheet, to enable switching back and forth between them. populated more definitions and links.