Add GPT support to Linux slicefix.
This replaces the hardcoded partition length-based detection of which MBR "version" is on disk, when deciding whether or not to rewrite the MBR/GPT. Now we just check the cited MBR/GPT version file, and use that length to compare the first partition length. We also prefer partprobe if it's available, rather than fdisk, for forcing a rescan of the disk partition tables.
Showing with 281 additions and 51 deletions