[LinuxCNC/linuxcnc Issue#596] Change default locatoin of Latency Histogram Screenshot

The latency-histogram default location for saving a screenshot is /tmp/latency-histogram. New users would be very confused trying to find the screenshot and not know that they need to navigate to someplace in their home folder before pressing save.

If possible the default save location should be the users home directory.

I looked at the code and tclsh is pretty greek to me. It looks like line 43 is where the directory is named

set ::LH(dir,screenshot) /tmp/$name

I don’t know if tclsh uses $USER or not…

JT