Miroslav Lichvar f8610d69f0 sources: improve handling of dump files and their format ...

Check for write errors when saving dump files. Don't save files with no
samples. Add more sanity checks for loaded data.

Extend the file format to include an identifier, the reachability
register, leap status, name, and authentication flag. Avoid loading
unauthenticated data after switching authentication on. Change format
and order of some fields to simplify parsing. Drop fields that were kept
only for compatibility.

The dump files now contain all information needed to perform the source
selection and update the reference.

There is no support kept for the old file format. Loading of old dump
files will fail after upgrading to new version.

2021-02-04 17:44:27 +01:00

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