Trival NO_COLOR=no double negative

NO_COLOR with default argcvt/natural boolean false values is as if it were unset in the first place.

Bug fixes & cligen/procpool.forkJoin

Bug fixes in HSlice parsing (both in argcvt and msclice) and in textUt.distDamerau.

Add a simple Unix-only cligen/procpool.forkJoin helper.

As usual, RELEASE_NOTES.md has more details and git log full details.

Add mslice.parseHSlice, cligen/sysUt.cfor, $MSlice(nil, 0) fix

Besides those three headliner items (also detailed in RELEASE_NOTES.md and with full details in the git log), also make some libs work with Nim-1.2 era client code again.

Actually, this release is a mistake. It should be 1.9.0..Hold on a few minutes.

I don't even know why I decided to bump the minor, but the RELEASE_NOTES.md has been that way for a while...

Portability release for OSX

c-blake/bu#5 revealed that I haven't been testing much on OSX this past 18 months or so. Try to make some things more portable at least "compile for me" - namely memrchr and cligen/puSig.

Drop need for `cgDoOptions` define

This was probably overzealous optimization of compile durations. See RELEASE_NOTES.md and git log for more details.

Add limited `Option[T]` handling hidden behind a define

Also a few documentation tweaks and some updates to the python/pq demo program for cg.py.

As usual, RELEASE_NOTES.md has more details and git commit log full details.

Add find-replace syntax for cligen/argcvt.argParse(string)

Also some slight enhancement to printedLen & printedChars for unprintable ASCII and some minor ""-safety fix ups.

RELEASE-NOTES.md has more details & git log max details.

Minor bug fix release

Address problem in rare cases where open() succeeds, but read() immediately fails.

Minor API updates

Release notes have more details and git log full details, but mostly just cligen/mslice.join/find, a new strUt.nearUnity4, and an fcvt bug fix.