- Implemented add and log commands using new infrastructure.
- Relaxed restriction about creating completed tasks with no dependencies.
- Localized CmdAdd.cpp CmdLog.cpp.
- Implemented Command::modify_task to apply command line arguments to a
specified task.
- Implemented Command::apply_defaults to apply various initial values to
a specified task, such as entry date.
- Eliminated stored arg_overrides and file_override in Context.
- Removed Filter, Subst, Task, Sequence from Context.
- Remove shadow file support. Hallelujah.
- Disabled/commented out most commands, ready for the big transition
to the new parsing style.
- Obsoleted Subst.{h,cpp}.
- Obsoleted Command::exectute 'commandLine' argument. It is worse
than unnecessary, it is an uncategorized raw argument string, which
is only really useful for the 'execute' command, which itself now
calls Arguments::combine to reconstruct the command line string.
