* The system image size is now calculated as: root size - home size.
* New function in `pmb/helpers/other.py`: `folder_size()`, with a
testcase.
* Instead of copying everything to the system image folder, and
deleting the home folder afterwards, do not copy the home folder
in the first place.
* Added `pmbootstrap -s` to skip generating the initramfs for faster
debugging.
* Set the default value in the "are you sure, that your partition has
at least..." to "y", so we can run `yes '' | pmbootstrap install`
to make it run through the whole installation process.
* Increase full size to 120%, boot partition gets 15 MB free space now
* Automatically compute the minimum size for the partitions
* Automatically resize the pmOS_root partition during the boot process
* Resize root partition only if there is unallocated space at the end of the device.
* Added more echos to make debugging easier while looking at the pmOS_init.log.
* Updated static_code_analysis.sh script to run shellcheck with `-x` option.
* The check for valid sdcard paths has been removed (because it
doesn't make sense for /dev/sd*, this might as well be a real
harddrive)
* New check: abort if any partition of the sdcard is mounted
* Automatically detect if the partitions are called "p1", "p2" etc.
or just "1", "2" etc. (/dev/sda1 vs. /dev/mmcblk0p1)
* pmb.helpers.mount.ismount(): check the source (new) and the target
path in /proc/mounts
