- Added an A3::is_attr type override for 'recur', which needs to be
treated as an un-expanded 'string' type, most, but not all of the
time.
- Documented the above in ColRecur.cpp.
- Modified Command.cpp to recognize both type 'duration' and name 'recur'.
- Removed Command::next_mod_group argument coalescing for date types,
which was not used anyway.
- Improved the error message for unrecognized durations, which previously
included the word 'date'.
- Modified unit tests to accomodate the above error message change.
- Added bug.972.t unit tests, which fail, because it isn't fixed yet.
- Made A3::dump const so it can be used anywhere.
- 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.
- Added feature #800, adding a new command 'columns' that lists all the columns
available for custom reports, and includes their formatting options (thanks
to T. Charles Yun).
- Refactored column objects to contain a ::validate method, for the
validation of incoming data.
- Context.columns is now a vector of one of each column object,
indexed by attribute name, for validation purposes.
- Changed the ::measure and ::render methods from pure virtual to
virtual.
- Fixed bug where recur.indicator used the length of the indicator
instead of the indicator.
- Implemented ColString.{h,cpp} to support generic Views based on
strings, not tasks.
- Implemented newly virtual Column:: methods.
