BRANCH 4.1:
   improved the element_names kwarg of TableLayoutWdg to strip the white spaces around the commas
   fixed a bug for spt.table.refresh_rows() when multiple tables are being drawn and the rows for one of the tables are being asynchronously loaded
BRANCH 4.1:
  ensured / is not ignored as a special symbol in keyword search suggestion
  ensured global mode can be set without specifying a column for KeywordFilterElementWdg