Create an image pyramid when writing a CZI using pylibCZIrw

[sebi06]

• Currently there is no image pyramid support when creating new CZIs
• When writing larger CZI files using pylibCZIrw no pyramid is created right now. Only the full-resolution level is created.
• When opening such images in ZEN the user first has to create a pyramid (manual interaction) because otherwise it is not possible to view the image in ZEN.
• Ideally we would either have an extension to libczi that can generate pyramids
• this could then be part of pylibczi as a separate method
• or a separate tool that can be called to generate pyramids (not the preferred solution)
• When opening such images in ZEN the user first has to create a pyramid (manual interaction) because otherwise it is not possible to view the image in ZEN.
• It is an open question if the pyramid creation must be done directly during"writing a CZi" or if this can be an additional step.

It is accepted that it takes some time to generate pyramids during creation.