Excel, small images will be scalled to large images and lose the original size

[speckyspooky]

The excel emitter (spudsoft) has an internal scaling to handle images in a special way for the excel output.
The excel which are too large and would overspan a cell will be shrinked, which is ok.
But images which have a smaller size like the cell will be grown.

The normal handling should be to keep the original image size of images which are smaller like the content cell.

Screen with 3 cases:

• Case 1: standard image size without scalling - Ok
• Case 2: large image which will be shrinked to th cell - Ok
• Case 3: small image will be grown - Error

I will provide a PR for that. As fallback I will provide a user-property to restore the original behavior.

[speckyspooky]

The change is included at PR #1753

The new user property is ExcelEmitter.ImageScalingToCellDimension (default: false). If it is set to true all images will be scaled to the cell dimension also the small images.

Screen of new handling

[speckyspooky]

The change is merged to the master.