CAM: Provide correct and more relevant header from Fanuc post processor

Fanuc only understand upper case letters, no point in providing the
file name in lower case letters.  The provided file name is always "-",
so drop it completely. The first comment is presented in the Fanuc user
interface, it should get more relevant content.

Dropped useless semicolon.

src/Mod/CAM/Path/Post/scripts/fanuc_post.py

@@ -245,17 +245,16 @@ def export(objectslist, filename, argstring):
 
     # write header
     if OUTPUT_HEADER:
-        gcode += ";\n"
+        # Get current version info
+        major = int(FreeCAD.ConfigGet("BuildVersionMajor"))
+        minor = int(FreeCAD.ConfigGet("BuildVersionMinor"))
+
+        # the filename variable always contain "-", so unable to
+        # provide more accurate information.
+        gcode += "(" + "FREECAD-FILENAME-GOES-HERE" + ", " + "JOB-NAME-GOES-HERE" + ")\n"
         gcode += (
-            os.path.split(filename)[-1]
-            + " ("
-            + "FREECAD-FILENAME-GOES-HERE"
-            + ", "
-            + "JOB-NAME-GOES-HERE"
-            + ")\n"
+            linenumber() + "(POST PROCESSOR: FANUC USING FREECAD %d.%d" % (major, minor) + ")\n"
         )
-        gcode += linenumber() + "(" + filename.upper() + ",EXPORTED BY FREECAD!)\n"
-        gcode += linenumber() + "(POST PROCESSOR: " + __name__.upper() + ")\n"
         gcode += linenumber() + "(OUTPUT TIME:" + str(now).upper() + ")\n"
 
     # Write the preamble