Use 64 bits for node IDs and SubtreeCache

[pav-kv]

No description provided.

[codecov]

Codecov Report

Merging #2394 (bbba3dc) into master (bfb7a0d) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2394      +/-   ##
==========================================
+ Coverage   65.71%   65.73%   +0.02%     
==========================================
  Files         107      107              
  Lines        7758     7758              
==========================================
+ Hits         5098     5100       +2     
+ Misses       2126     2124       -2     
  Partials      534      534              

Impacted Files	Coverage Δ
storage/cache/subtree_cache.go	54.16% <ø> (ø)
storage/memory/log_storage.go	3.50% <ø> (ø)
storage/mysql/log_storage.go	65.48% <ø> (ø)
log/operation_manager.go	88.35% <0.00%> (+1.05%)	⬆️

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[pphaneuf]

This is very nice, thanks!