Only increment port number if we actually are going to try it

Otherwise we leave the port number 1 higher than it should be,
and avahi will advertise this to the network. Then the clients
all try connecting to the wrong port and nothing works (surprise!)

This should hopefully address #97.
Merge ncbo patch for (close #98)
Lang constants for the resolution of lang RIDs (close #100)
Test to check number comparisons on FILTER.
Patch for 'Comparison with negative number' #99
Exemplar data corrected (a consequence of #99)
In some cases an fs_rid_set could contain duplicates.
Tracing log message for HTTP Content-Type
More modern auto* directives
Clearer resource symbols error text
More robust error handling
Added a missing update commit stage!
pagination with offset & limit combined with filter
tests for pagination with filters
merge main 4store repo