* Extended status codes, so that we can tell the user
exactly why we don't want to load a "supposed microcode",
e.g. "extended table checksum is incorrect".
* Compressor support (gzip, others) without the need for
stdin tricks (gzip -dc file.bin.gz | iucode_tool -k -).
VERY useful for .dat files, less so for .bin files.
* Microcode selection:
* select microcodes which were already installed in -K dir
* select/unselect by signature+pfmask+revision
* change code to actually be able to select and merge in
a lossless way, would simplify things a lot.
* error handling
- return status when we skip a ucode? when we skip a file?
* --overwrite: removes symlinks. Maybe it would be better to fail?