JS: Have ExpError output a more detailed error string
JS: Have ExpError output a more detailed error string

This does output a multiline string that indicates where the error
occurred, but only works on a monospace font

Signed-off-by: Matt Chudleigh <0ca390ed93f516590d05286882efa52bb3b35616@ausenco.com>
Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim