ENH: Test for .png extension removed in CanReadFile() method.      Test for .PNG or .png extension added in CanWriteFile() method.      This allows now to read PNG files that lack the explicit extension      .png or .PNG.      This fixes Bug # 194.
ENH: Test for .png extension removed in CanReadFile() method.
     Test for .PNG or .png extension added in CanWriteFile() method.
     This allows now to read PNG files that lack the explicit extension
     .png or .PNG.
     This fixes Bug # 194.

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