add "within:" line for stxparse errors
  related to PR 13806
improve wording of "expected more terms" messages
fix named let: errors
  closes PR 13806

Still to do: document the subtleties of ~and w/ error reporting.
include -test pkgs in aggregates
fix missing sqlite3.dll with raco distribute
  closes PR 14025
Improve transform.

* Make it close the source file after it has finished reading.
* Run in parallel when the file are supplied via the command line.
Replace calls to display with write-string.
Make known bugs executable.
Tests use `test-engine/scheme-tests`
add #:when to match
document #:when for `match`.
Fix `db` dependency warning.
Various doc contract fixes
Fix sandbox docs

This sentence appears to be the result of a
copy+paste error
Major revision of subtyping code.