* maxUploadSize -> scMaxEachPostBytes, default is 1MB on both sides (was 2MB on the server)
* minUploadIntervalMs -> scMinPostsIntervalMs, default is 30ms on the client (no server support for now)
* maxConcurrentUploads -> scMaxConcurrentPosts, default is 100 on both sides (was 200 on the server)
Testing was conducted only using explicit parameters, and using
testsuite. However, when the parameters are not explicitly set in JSON
config, it seems that `c.MaxUploadSize` will contain `RandRangeConfig {
From: 0, To: 0 }` instead of `nil`, which breaks upload entirely.
* maxUploadSize and maxConcurrentUploads can now be ranges on the client
* maxUploadSize is now enforced on the server
* the default of maxUploadSize is 2MB on the server, and 1MB on the client
* the default of maxConcurrentUploads is 200 on the server, and 100 on the client
* ranges on the server are treated as a single number. if server is configured as `"1-2"`, server will enforce `2`
* querystrings in `path` are now handled correctly
