- Disallows 2-digit times, such as 14 (2pm). Now requires at least minutes
included as well. This is likely to need further review, and possible dropping
of all non-extended date forms (hhmmss, yyyymmdd), otherwise there will always
be confusion between ID, UUID and ISO8601 dates.
- Removed 2-digit time tests.
- TW-1254 Calc command can segfault on negative numbers (thanks to Renato
Alves).
- Implemented a recursive descent parser to syntax check the expression,
and disambiguate unary minus. The syntax checking is not generating any
diagnostics yet.
