ADF support with disk recovery!

[admin]

SCP can now generate ADF files for use with emulators. This support uses a complex algorithm designed to recover lost data. So, disks with read errors reported on an Amiga can likely be dumped to an image, completely recovering the data!

I am working on the same support for D64 image files, recovering 1541 disks as well as ST/MSA image files, recovering Atari ST disks.