Merge pull request LinuxCNC#2756 from tjtr33/barWidgets

Bar widgets

configs/tomp/nuPyvcpBars/NuHbarRun.txt

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+to run a config using the new pyvcp bar widgets
+is like othe configs
+
+you will create an .ini, a custon.hal, and xnl
+and
+uf you want graphical thumbs ( the marker that moves aloong the bar)
+ you will need to create a small python tkinter .py file that draws the marker
+ ( and set the tag' dwgf to that file spec )
+ or creates/copy a suitible png file
+ ( and set the tag 'imgf' to that file spec )
+
+i used a full file spec for imgf
+i placed my .dwg file alomgside pyvcp_widgets.py
+  which is in /lib/python3/dist_packages/   for NON RIP
+  and is in ~/linuxcnc-dev/configs/tomp/NuPyvcpBars/  for me ( ymmv)
+
+my test .imi is  pyTktab04.ini
+   the .ini will use AXIS gui and create a pyvcp tab with many aniumated bars
+   the ini expects local file  bars.xml ( same dir as .ini)
+   the .ini's PROGRAM_PREFIX must be adapted to your situation
+   the .ini [FILTER} section was chamghed to   py - python3   izzat necc/good?
+   the .ini [HAL] section has  POSTGUI_HALFILE = custom4.hal
+
+place bars.xml in same dir as .ini
+
+place custom4.hal in same dir as .ini
+
+custom4.gal requires rand9
+  a python hal comp that is a random number generator 
+    used to to drive bar widgets
+    so ramd9 must be with the other hal comps 
+

configs/tomp/nuPyvcpBars/NuNarTest.txt

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+to test the pyvcp bars
+
+edit bars1.xml to change tag values
+   use <!--tag?value</tag--> to hide trials
+
+edit bars1.hal to change driver propetries
+  the drive for the bardemo is a siggen
+  the amplitude and offset must agree with the xml min and max
+  for example in min is 0 and max is 100
+    then the siggen sin amplitude is *max-min)/2 = 60
+    and the offset would be -
+  for example, if min is -125 and max is -32
+    then the amplitude is (-32 - -125)/2 = 45.5
+    and the offset will be ( -32  - 42/.5 ) = -74.5
+    ( the sinus will oscillate about -74.5, 
+      rising towards Min od -32 
+      and falling towards -125
+   You can adjust the freq as desired but note
+   there seems to be a beat freq on my system, 
+   you mayt experience it too,
+   so use freqs od 10 20 30 40 50 60 etc
+   It maybe my monitor or the thread speed or both. oi dunno
+   It is not an error of the program
+
+to run your test on a RIP
+cd 
+cd path/to/your/linuxcncdev/dir
+   mine is ~/linuxcnc-barwidgets/configs/tomp/nuPyvcpBars$ 
+   yours will be something like the following
+cd ~/linuxcnc-dev/configs/<dirwhere you have your test .xml and .hal >
+
+halrun -I -f bars1.hal
+
+have fun
+tomp
+
+