Master depth calculation

[gfcapalbo]

replaces, #40 , wich was created by hussam after reverting .
PYTHON < 3.5 NOT SUPPORTED. (will exit doing nothing) subprocess.run was instroduced in that version.
tested on python 2.7 and 3.10.

If ran on 2.7, it will produce a message warning user "automatic update depth not supported for python < 3.5" and continue normal execution.

[gfcapalbo]

CC @thomaspaulb
@Hussam-Suleiman your message about multiple version supported should not be a problem.
this MR adds automatic depth calculations for python 3.5 and above.
for lower versions it just prints a message "no automatic depth supported".

Supporting python <3 would require a lot of coding , which i think is not warranted to support deprecated python versions.
it does not harm py 2.X projects.