0029967: Draw Harness - command bounding has annoying syntax

Bnd_OBB constructor from Bnd_Box is fixed for VOID input.

DRAW command bounding command is adjusted:
- Support of old syntax 'bounding shape'is restored.
- Exception on VOID bounding box is avoided.
- Arguments are handled in case-insensitive way.
- Options -s, -perfmeter, and ability to set result as first argument are removed as redundant.
- Help is moved to command definition.

Separate command OCC29311 is added (in QADraw) to do the same as option -perfmeter did; tests are updated.

samples/tcl/Penrose.tcl

@@ -41,7 +41,7 @@ tcopy bxx b10
 
 # make some boxes hollow
 for {set i 1} {$i <= 1} {incr i} {
-  set dim [bounding -s b$i -save xmin ymin zmin xmax ymax zmax]
+  set dim [bounding b$i -save xmin ymin zmin xmax ymax zmax]
   set dx [dval xmax-xmin]
   set x1 [dval xmin+0.1*$dx]
   set x2 [dval ymin+0.1*$dx]

samples/tcl/snowflake.tcl

@@ -135,7 +135,7 @@ vfit
 
 # add dimension:
 # detect vertices extremal in X direction
-bounding -s snowflake -save x1 y1 z1 x2 y2 z2
+bounding snowflake -save x1 y1 z1 x2 y2 z2
 plane f1 x1 0 0 1 0 0
 plane f2 x2 0 0 1 0 0
 mkface f1 f1