Removed single-stream throttling on high bandwidth-delay links from accidental defaults #661, #122:
- Changed the default receive windows from 3MB (≤ 160Mbps with 160ms RTT) to 32MB (≤ 1600Mbps with 160ms RTT).
- Added guide for tuning Linux kernel TCP windows.
- Increased NaiveProxy's HTTP/2 flow control window size default configuration from 3MB to 32MB.
Both kernel TCP and userspace HTTP/2 window sizes must be increased to take effect for the high bandwidth-delay links.