run-tests: fix an unnoticed check-code violation

run-tests: add a --compiler option Without this option, it is not possible to run the test suite on Windows using mingw's gcc as the compiler.

run-tests: make build command line less intimidating Use a dict for parameters to the format string, instead of a ridiculous number of positional parameters.

hooks: be even more forgiven of non-fd descriptors (issue3711) Looks like there are instances where sys.stdout/stderr contain file handles that are invalid. We should be tolerant of this for hook I/O redirection, as our primary concern is not garbling our own output stream.

hooks: delay I/O redirection until we actually run a hook (issue3711) We were attempting to redirect I/O even if no hook was actually getting called. This defers redirection until we've found something to do.

util: make chunkbuffer non-quadratic on Windows The old str-based += collector performed very nicely on Linux, but turns out to be quadratically expensive on Windows, causing chunkbuffer to dominate in profiles. This list-based version has been measured to significantly improve performance with large chunks on Windows, with negligible overall overhead on Linux (though microbenchmarks show it to be about 50% slower). This may increase memory overhead where += didn't behave quadratically. If we want to gather up 1G of data to join, we temporarily have 1G in our list and 1G in our string.

revset: backed out changeset 54cedee86e51 This was causing clones of the hg repo to go from 12.4s to 14.7s.

hgk: specify some colours explicitly in hex Tk 8.6b3 uses web colours, where green is defined as #008000, not #00ff00, and grey is #c0c0c0, not #808080, so specify those colours explicitly.

hgk: no committer please Generate committer only if we really have it. Update test-hgk.t accordingly.

hgk: use Ttk instead of plain Tk Use Ttk (themed Tk) for most of the widgets. Default to xpnative theme on Windows, clam otherwise. Provide a shim for Tk 8.4 without Tile/Ttk.