task -set blend tolerance default based on machine units

A very common newbee complaint is huge corner rounding.
This is caused by linuxcnc setting the default blend tolerance to maximum.
Now we set it to a (seemingly) reasonable default depending if the machine
is metric or inch.

- modify the startup runtest for G64 p startup change

Author: c-morley

src/emc/task/emccanon.cc

@@ -2569,7 +2569,6 @@ void INIT_CANON()
     canon.g92Offset.w = 0.0;
     SELECT_PLANE(CANON_PLANE_XY);
     canonUpdateEndPoint(0, 0, 0, 0, 0, 0, 0, 0, 0);
-    SET_MOTION_CONTROL_MODE(CANON_CONTINUOUS, 0);
     SET_NAIVECAM_TOLERANCE(0);
     for (int s = 0; s < EMCMOT_MAX_SPINDLES; s++) {
         canon.spindle[s].speed = 0.0;
@@ -2599,6 +2598,12 @@ void INIT_CANON()
 	    ("non-standard length units, setting interpreter to mm");
 	canon.lengthUnits = CANON_UNITS_MM;
     }
+    /* Set blending tolerance default depending on units machine is based on*/
+    if (canon.lengthUnits == CANON_UNITS_INCHES) {
+        SET_MOTION_CONTROL_MODE(CANON_CONTINUOUS, .001);
+    } else {
+        SET_MOTION_CONTROL_MODE(CANON_CONTINUOUS,  .001 * MM_PER_INCH);
+    }
 }
 
 /* Sends error message */

tests/startup-state/test-ui.py

@@ -303,7 +303,7 @@ def assert_axis_initialized(axis):
 assert(s.read_line == 0)
 assert(s.rotation_xy == 0.0)
 
-assert(s.settings == (0.0, 0.0, 0.0, 0.0, 0.0))
+assert(s.settings == (0.0, 0.0, 0.0, 0.001, 0.0))
 assert(s.spindle[0]['brake'] == 1)
 assert(s.spindle[0]['direction'] == 0)
 assert(s.spindle[0]['enabled'] == 0)