textproc/bibtool: update to 2.68
rP531759
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Description

textproc/bibtool: update to 2.68

Handling of extracting by aux file improved.
Record extended by attribute lineno. This attribute carries the line number of the initiating \@.
The format of the error messages has been slightly streamlined. Double spaces are avoided; two colons in one message are avoided.
The format of the messages of check_rule include file and line number.
Warning for double fields added.
The empty output file is used to signal that the output should be suppressed.
The resources check.warning.rule and check.error.rule have been introduced to allow semantic checks to be classified as warning or error.
The behaviour of the resource check.double has been generalized. The requirement of double entries to be adjacent has been dropped. This has the impact that the processing is slightly slower.
New resource file unique.field intruduced. With this resource it is possible to specify additional unique constraints for fields. If different records have the same value for one of those fields then a warning is issued.
Static library renamed from libbib.a to libbibtool.a.