Correcting some rough edges in lukshome example hook.

  * 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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