logo handling

[azra1l]

i suggest to add functionality to:

• let the user drag a desired logo for a package onto the image field or double click the empty field to bring up a file selection dialog
• crop/resize/center the image at 160x160 px, if not already at that size (optional)
• change background color to transparent, if not already transparent (optional)
• save with an arbitrary name (optional) using one of the supported formats (png/jpg/bmp) (optional) in the CLIENT_DATA folder
• allow editing the file using default image editing tool upon double click

image processing should be possible using imagemagick: https://wiki.python.org/moin/ImageMagick

[pandel]

Thanks for your suggestions. I'll take that into account when it comes to further development ;-)