[Libguestfs] [PATCH supermin 0/2] helper: Implement device trees.

This two-part patch for supermin implements device trees (for ARM). The first patch introduces a more rational way to handle command line arguments in 'supermin-helper'. See the commit message for details. The old style is still supported for compatibility. The second patch adds an extra supermin-helper --dtb parameter specifying a wildcard. A device tree file which matches the selected kernel and this wildcard is linked to (or copied if --copy-kernel). The intended use is from libguestfs (on ARM) which can now do: supermin-helper -f ext2 --dtb 'vexpress-*a9.dtb' [etc] which will create a 'dtb' file alongside kernel, initrd, etc in the appliance directory. Qemu is invoked using: qemu-system-arm -kernel kernel -dtb dtb [...] (or the equivalent via libvirt). Rich.