v.1.0.42: block devices supported in macOS also

- a get_size suited for macOS X is added in disk.py
- hints in README.md added

v.1.0.41: added get_size for Linux block devices

os.stat fails on Linux devices, so their size was always zero!

v.1.0.40: FAT map_free_space fixed

fat_slot is now c_int to ensure the correct size of 4 bytes (instead of 8) is picked with Linux also

v.1.0.39

A bug was fixed that could corrupt a sorted exFAT root table

v.1.0.38

allows VHDX childs in any directory

uses new utils.calc_rel_path in VHDX and  generates good child VHDX images in directories other than parent's one

v.1.0.37: fix calc_rel_path

• now a child image relative locator contains the correct relative path to its parent (=relative to itself)
• adds a generic relative path calculator to utils

v1.0.36

Add boot capability in MBR

partition() is now able to create an active and bootable primary MBR partition with  universal boot code (LBA/CHS).

Fix the phys drv num bug for ALL floppy types

set drive number 0x80 for HDD only

Now *all* kind of floppies will get the correct phyisical drive number (00h) in FAT BPB

v1.0.34 fixed a bug preventing floppy boot code to work properly

fixed a bug in mkfat

chPhysDriveNumber is set to 0x80 only for non-floppy media types (or floppy boot code could fail)

v1.0.33: enhanced imgclone

- imgclone can now operate from/to physical disks, not only images
- enhanced information (statistics) during data transfer