GeezerVison

RunSql::getQueryType() looked at the start of the statement text, but the
text SQLite hands back for a statement includes any comments in front of
it. A script like "-- compact\nVACUUM;" was therefore classified as an
ordinary statement, wrapped in a savepoint and failed with "cannot VACUUM
from within a transaction" (the same applies to VACUUM INTO and to PRAGMA
statements that must run outside of a transaction). Skip whitespace and
comments before matching the keyword.

Add a test-run-sql target which runs scripts through RunSql against a real
database.