great stuff

• firefox no longer leaking memory like crazy during large uploads
  • not fixed intentionally (the firefox bug still exists i think)
    • one of the v0.10.x changes are accidentally avoiding it w

good stuff

• up2k-cli: conditional readahead based on filereader latency (firefox was not happy)
• up2k-srv: make sparse files on windows if larger than --sparse MiB
  • files will unsparse when upload completes if win10 or newer
  • performance gain starts around 32 and up but default is 4 to save the SSDs
• up2k-cli: fix high cpu usage after returning to idle
• up2k-cli: ui tweaks
• browser: give 404 instead of redirecting home when folder is 404 or 403
• md-srv: stream documents rather than load into memory