partitionOffset should be the sector, not the byte
* FileSystemIDandChk/PartPlugins/MBR.cs:
Corrected typos on field offsets
* FileSystemIDandChk/Plugins/FAT.cs:
* FileSystemIDandChk/Plugins/ISO9660.cs:
Corrected typo
* FileSystemIDandChk/Plugins/ext2FS.cs:
Superblock block_size is shift of base block size (1024
bytes)