Patch specific subdirectories

[szapp]

The instructions on how to design a patch suggest all file names to contain the patch name. The reason for this is to prevent patches from mutually overriding files with same path in the virtual file system.

While being very inconvenient and producing long, inflexible file names, it is also easy to forget and thereby cause hard to spot compatibility issues. Instead suggest patch-specific subdirectories. They will result in unique file paths, but allow for arbitrary file names.