initial dates checkin
Rudimentary dates
Numbers
More nonterminals
Use chronic terminology (scalar)
Start chronic definitions.rb
More repeaters

Repeaters are recognized in repeaters.rb.  Their semantics is defined
separately, in repeaters/*.rb
Remove duplicate nonterminal
More from definition.rb endianness
Better endian handling
Time abstract syntax
Time AST, tweaked
Work on date format
Add day portion to time
Work on date arithmetic
More date/time calculations
Prep for integration
Rename
Dateparse integration, more handlers
Better snooze integration