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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.

Some versions of mktemp do not support differing filename suffixes.

This avoids unexpected failures with no or poor error messages.

Comments may consist of more than one line.  So far, only the first
line was deleted without fixing brackets thus corrupting the file.
From now on, the comments are deleted as a whole.