Stepconf: reversed test this axis defaults for mm and inch
now mm is 15 and inch is .5 which is a safer default

Signed-off-by: John Thornton <jthornton@gnipsel.com>
docs: add docs on how to contribute to LinuxCNC

Pointers to our communication channels, git repos, & bug tracker.

Links to external git tutorials, but this doc purposefully does not
contain any git tutorials.

Best practices for writing good code & good commits.
docs: give some examples of public git servers

Thanks to Charles Steinkuehler for the suggestion.
axis: drop seticon hack

Since tk8.4.8, [wm iconphoto] has been able to set photo images as
window icons, so the seticon hack is not necessary.  Furthermore, it was
causing crashes on some systems and ineffective on others.

Also, the Img package (which can load png images) has been required for
the latencyhistogram script, so this is not a new requirement.
Merge branch 'axis-no-seticon'
docs: use imperative form consistently
Update Makefile for vfdb_vfd

(cherry picked from commit 6063f751d7c4dd0f9fe28f945ed6225654bca40b)

Conflicts:

	configs/araisrobo/css/css.ini
	src/Makefile
Initial commit for DELTA VFD-B Spindle Driver

(cherry picked from commit ec203808b2e3039c93aba51bf9f999ca602e3aeb)

Conflicts:

	configs/araisrobo/css/css.ini
Update implementation for DELTA-VFD-B Inverter, vfdb_vfd.c

(cherry picked from commit 411a62d799ca512baacdac7dc4f72a024a39e117)

Conflicts:

	configs/araisrobo/css/css.ini
	configs/araisrobo/css/vfdb_vfd.hal
vfdb_vfd: add '-m' linking parameter to Submakefile

(cherry picked from commit 54e2baf5c61483b461d4048c9ed7090d96bf19ff)
Add RPS hal signal to vfdb_vfd.c

(cherry picked from commit 2c7517679ab6cd2dbf8912605944e7d0329a5197)

Conflicts:

	src/hal/components/spindle_aux.comp
vfdb_vfd.c: update VFD-B CMD register definition

(cherry picked from commit 280d291f34f050fb3055cf9c5bf8cb48079807e3)
vfdb_vfd.c: can do FORWARD and REVERSE spindle rotation

(cherry picked from commit c2caa2a9e69fc1d03d1daeed786ec35d5c48c7ef)

Conflicts:

	src/hal/components/spindle.comp
	src/hal/components/spindle_aux.comp
vfd-b: finish rename from "vfs11" to "vfdb"
vfd-b: add a manpage

This started life as a copy of vfs11_vfd, by Michael Haberler and John
Thornton.
vfd-b: make motor frequency & speed into ini parameters
vfd-b: report at-speed correctly
vfd-b: fixup copyright
vfd-b: whitespace cleanup
vfd-b: remove a redundant assignment