* Increase PackOutputStream copy buffer to 64 KiB
* Tighten object header writing in PackOutuptStream
* Skip main thread test in ThreadSafeProgressMonitor
* Declare members of PackOutputStream final
* Always allocate the PackOutputStream copyBuffer
* Disable CRC32 computation when no PackIndex will be created
* Steal work from delta threads to rebalance CPU load
* Try to send HTTP error messages over sideband
* Extract the capability parsing logic in {Upload,Receive}Pack
* Make capability strings in BasePack{Fetch,Push}Connection public
* Fix a typo in "capabilities" in ReceivePack
* Keep track of a static collection of all PackWriter instances
* Estimate the amount of memory used by a PackWriter
* Add an object encapsulating the state of a PackWriter