Merge topic 'docs-mention-configure-debug-flag'

1123867a docs: mention the new configure debug flag
8060fec5 superbuild: bump for new debugging flag

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Utkarsh Ayachit <utkarsh.ayachit@kitware.com>
Merge-request: !598
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