Wrote function to process records from tabular files.
Wrote function to process records from tabular files.

* Wrote `delimited.project_parse_fields` to (optionally) project and
  then parse text fields into values.  This provides the basis for
  treating tabular files as a table of values.
* Implemented to be as fast as possible by using arrays instead of
  `Header`s, by continuing the loop at the earliest point, and by
  externalizing the record processing setup which is constant across
  records.
* Designed to be curried so as to take only a record as argument.

afbarnard/fitamord