Like the other table syntaxes (pipe, simple, and multiline tables) and
block-level constructs generally, a grid table may now be indented by up
to three spaces and still be recognized as a table. Previously the
grid-table parser required the table to begin at the left margin, so an
indented grid table was parsed as a paragraph.
The leading indentation is stripped uniformly from each line before the
table is parsed, so an indented grid table produces the same AST as its
non-indented equivalent.
Adds a command test.
Johan Larsson