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This is nessesary to do proper testing of the new peak spec

Mass ordering check

Closes #4 and #8

See merge request !8

Mass ordering check omega check

See merge request !9

fix inheritance

This was causing a return value != 0 even when all interfields were
valid.

Revision date was (most likely) a legacy name that never had its
`lvcnrpy` integration test updated.

One addition convinience method to facilitate the modification of
datasets fields.

The two additional convinience methods facilitate the modification of
fields other than the (now) optional field derived field test classes
represent.

Add optional attribute to specification fields

See merge request !7

- `auxiliary-info` is specified as an optional field.

- `lvcnrcheck` gives a return code of `0` if the only failing fields are
  option and missing.

  However if fields are present and fail for other reasons (for example
  wrong type such as `str` when it should be `int`) then the return code
  will be `1`.

Use format field in file as lvcnrcheck default

See merge request !6

Falling back to format level 1 if the field is missing in the file to be
checked.

Update lvcnrcheck with pass/fail information

See merge request !5