SketchUcam v1.5

A minor update:
Help updates
added MAC help section
arcmoveij() is INCREMENTAL mode.

• the 'incremental' form of IJ is used so make sure you set your controller to incremental mode by issuing G91.1
• Setting or un-setting this does not change the actual Gcode, arcs are ALWAYS incremental mode, this setting just tells the controller what to expect.
• you can add this code to the G-code via the Options menu
• an option to output G91.1 as part of the Gcode header has been added to the Feature Options menu.
• GPLOT will NOT like this option and will not display the plot. You should rather set your controller to default to this mode.

Solve failure to find profile path on Mac (for real this time)
Sketchup on MAC still has the old .openpanel bug that prevents the use of wildcards. Mac platform is now detected and wildcards avoided.
Note that the file select dialog allows selection of a folder, but the profiles folder will always be used no matter what you select.