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- There was another bug with ordering resources when multiple libraries
were involved. This time the way library_nr was calculated was changed
so that it wouldn't happen anymore.
The intent of library_nr was to have it always be 1 higher than the
maximum library_nr of any libraries this library is based on.
In practice this wouldn't always happen, because each resource had
its own library_nr. In some circumstances the resources in libraries
depending on other libraries would consistently get a library_nr too
low, as each resource they were based on had a library_nr that was
too low as well, even though another resource could exist in that
library with a higher library_nr. This could cause the library_nr of
all resources in a library to be too low.
This is now fixed to moving library_nr to the place it should've
maintained on in the first place: the library itself. It is
calculated now once per library, just before the resources are
sorted for the first time during the application's run. Since by the
time resources need to be sorted all resources are known, the library_nr
can be calculated correctly.