- Removed deprecated 'fg:' and 'bg:' attributes, which involves code,
documentation and tests.
- Cleaned out NEWS file.
- Cleaned out config import synonyms, which should have been deleted a while
ago.
- Removed unused localized strings, but left the 'deprecated' one behind,
because it will be needed.
- Added bounds check before call to string::substr to avoid passing a
negative start pos. Test rc.t was broken from commit 0ac9a4b because
it contains 'report.:b' and legacyCheckForDeprecatedVariables was
trying to substr starting from pos 'length() - 12' (-3).
- Added support for more type-specific checks of attribute values.
- Added support for more type-specific attribute rendering.
- Improved generalized methods for checking columns in a report.
- Added unit tests.
- Minor code cleanup.
- Added secret hidden feature for internal testing.
