* several rephrasing to clarify/correct things because some wording
was ambiguous/wrong.
* changed instructions to use a mounted partition when creating the
file. In the previous instructions the present directory was used and
if it was $HOME, then the file was created in the live memory
(aufs/unionfs). Of course using memory to create the file would limit
the size of the file to the size of free memory.
* moved part of the instructions to inside create-lukshome-file.sh so
the user can see them because the hook itself is not saved in the
built live system.
* added a check to see if /mnt directory is empty.
* added some missing "umounts" and "cryptsetup remove" in some error checks.
* removed the proposal of copying from another mounted /home/
directory. It could be confusing to the user. The user should do it
later, with the live system booted with lukshome boot option, which
should be the next thing he/she will do anyway.
* renamed variable ERROR_LEVEL to EXIT_CODE (sounded too much a
redmond batch file).
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