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* Update nearby/neighbour leaf nodes finder details: Update return error codes so that in the case that there is no more leaf node beyond the search direction, the particular error code `NearbyBeyondRange` is returned. * Compile largest interval range containing only this leaf point why: Will be needed in snap sync for adding single leaf nodes to the range of already allocated nodes. * Reorg `hexary_inspect.nim` why: Merged the nodes collecting algorithm for persistent and in-memory into a single generic function `hexary_inspect.inspectTrieImpl()` * Update fetching accounts range failure handling in `rangeFetchAccounts()` why: Rejected response leads now to fetching for another account range. Only repeated failures (or all done) terminate the algorithm. * Update accounts healing why: + Fixed looping over a bogus node response that could not inserted into the database. As a solution, these nodes are locally registered and not asked for in this download cycle. + Sub-optimal handling of interval range for a healed account leaf node. Now the maximal range interval containing this node is registered as processed which leafs to de-fragementation of the processed (and unprocessed) range list(s). So *gap* ranges which are known not to cover any account leaf node are not asked for on the network, anymore. + Sporadically remove empty interval ranges (if any) * Update logging, better variable names