Docs: clear up description of behavior when axis words are used.

Signed-off-by: John Thornton <jthornton@gnipsel.com>
French doc. update to follow John

Signed-off-by: Francis Tisserant <tissf@free.fr>
French doc. update: added a link to Contributing to LinuxCNC

Signed-off-by: Francis Tisserant <tissf@free.fr>
docs: update realtime info

LinuxCNC no longer uses RT-Linux, and rtlinux.org is dead.
docs: fix a broken link to nist.gov
docs: fix a broken link to pico-systems.com
docs: fix html metadata problems with index.tmpl
Fix arc acceleration constraint

This fixes an accel constraint violation in Z if you set all maxvel to 8.3333,
all maxaccel to 30, and run this arc, to see the violation at its start
(between the G1 and G2):

G20 G40 G80 G90 G94 G64 F999
G0 X0.2320 Z-0.0771 Y0
G1 X0.2560 Z-0.1203
G18 G2 X0.2620 Y0 Z-0.1134 I-0.0025 K0.0082
M2

I think the key is that this arc is straightish (line-like) and diagonalish
(the endpoints aren't pretty much along just one axis direction).
configs: remove files with no permission to distribute

These files are not needed to build or run LinuxCNC, and there is no
statement of permission to distribute these files.
Merge branch 'v2.5_branch'
Combi_DRO - shows warnings invalid font-size

Fixed a font_size handling problem, resulting in values not allowed by
the font_size property, fixed that
gmoccapy_0_9_9_4 - fixed some warnings

ver. 0.9.9.4
- initializing some warnings at start up, corrected that
- deleted some unneeded print messages
Merge branch 'master' of ssh://norbert@git.linuxcnc.org/git/linuxcnc.git