Code cleanup, simplification and shrinkage.

Eliminate the function get_setsdir() by merging it into
install_mounted_fs(). Eliminate global SETSDIR as a result.

Move the loop logic used to select the directory to use on a mounted
filesystem to a 'done' style loop. i.e. loop until valid input (a
directory which exists) or 'done'. 'done' implies abandoning effort to
find a directory.

Eliminate the test for and associated error message about no
filesystems being mounted below the mount point passed to
install_mounted_fs(). This served little purpose not addressed by the
message generated when a non-existant directory is entered.  i.e.
novices won't understand and experts can '!' out to investigate.

Remove the option to list mounted filesystems. Same reasons as for
eliminating the test for mounted filesystems.

Move repeated tests for an empty GET_FILES into the function
invariably called after the tests (install_get_files()).

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