Currently multiple warnings are saved in an elektra non-conforming array
notation which is limited to 100 entries. The notation of #00 is against
the design decision made.
The format should be aligned with the correct array notation,
starting with #0. The maximum number of warnings will stay at
100 entries (#0 - #_99).
To keep the ordering we add an underscore _ once we go to
beyond 10 warnings (#_10).