[LyX/master] Start reporting missing citations and broken references in LaTeX build.

[Pavel Sanda]

On Sat, Mar 14, 2020 at 09:46:22AM +0100, Jürgen Spitzmüller wrote:
> Am Freitag, den 13.03.2020, 16:45 +0100 schrieb Jürgen Spitzmüller:
> > A major problem with this is that it breaks
> > 
> > 1. children stand-alone compiling if they have references to siblings
> > or their master
> > 
> > 2. multi-part documents compiled with "includeonly" and "maintain
> > counters and references: no" that contain references to excluded
> > children
> > 
> > I think this is a central use-case which is basically defunc'ed with
> > this change.
> 
> I mitigated this problem now: If a reference is reported as unknown, we
> check whether it exists in the master or a sibling. If so, we do not
> error (the references are still warned about in the log).

Thanks for taking the compromise approach. Pavel