Quoting

- Removed automatic dequoting by the Lexer.
- Implemented Lexer::dequote for manual control.
- Variant dequotes string values when appropriate.
- Fixed some unit tests that became wrong.

ChangeLog

@@ -184,6 +184,8 @@
 - TW-1441 task import continues happily if filename doesn't exist.
 - TW-1444 Tag ordering is preserved, but should be sorted in reports.
 - TW-1460 Empty due dates lead to endless loop.
+- TW-1463 A few more problems with special characters in filters, pluses,
+          question marks, and braces (thanks to Ralph Bean).
 - Added new holidays.xy-XY.rc definition files
 - Removed deprecated 'echo.command' setting, in favor of the 'header' and
   'affected' verbosity tokens.