Directory based image paths.
Soon, we will have images with both full images and deltas, for the same image version. To make this possible, the image path will now be a directory instead of a file, and all of the versions (ndz,sig,sha1,delta) files will reside in the directory. A new config variable IMAGEDIRECTORIES turns this on, there is also a check for the ImageDiretories feature. This is applied only when a brand new image is created; a clone version of the image inherits the path it started with. Yes, you can have a mix of directory based and file based image descriptors. When it is time to convert all images over, there is a script called imagetodir that will go through all image descriptors, create the directory, move/rename all the files, and update the descriptors. Ultimately, we will not support file based image paths. I also added versioning to the image metadata descriptors so that going forward, old clients can handle a descriptor from a new server.
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