opts was not cleared

Change-Id: Ie38959c5c18ae52b7c96d9b09a07562b4cb6d1d7
Remove useless declarations (Visual Warnings)

Change-Id: I0fe4dfae4de61cc2c09680a6db444a203e12c4fa
* Bug #7698 fixed - The "Graphics\Animations\Riemann surface" demo
                    background is black (instead of white).

Change-Id: I55385ead825e36ea63d331e7d2c4722b54b4677a
* Bug #12246 fixed - Return an error message when reading invalid excel files (which have declared wrong column/row count)

test_run("spreadsheet","bug_12246",["no_check_error_output"])

Change-Id: Ie5a51922df318dd15d85325548fa13a8f81780a8