GitLab

The @ sign impeded determination of the entry type in the first record.

Now all features of bib-format are applied to any file.

For Incollection, Journal is not defined so use Series.

Only the English alphabet, - and _ are allowed in field names
in order to avoid erroneous detection in multi line contents.

Prepare failing test cases with either a blank or opening bracket.

Otherwise it is easily lost in pipes so users
would miss any information on syntax errors.