Missing features from Ninja

Windows is only partially implemented.
- deps = msvc (parsing of /showIncludes output) isn't implemented at all, which means n2 currently gets header dependencies wrong when you use the MSVC compiler.
Dynamic dependencies.
console pool. n2 currently just treats console as an ordinary pool of depth 1, and only shows console output after the task completes.
subninja is only partially implemented.

Missing flags

-l, load average throttling
-n, dry run

Missing subcommands

Most of -d (debugging), -t (tools).

No -w (warnings).