More cleanup/shrinkage/clarification.

a) Eliminate single invocation here document functions
   not_going_to_install(), congrats() by putting the here
   document at the point of invocation.

b) Make (deliberately) global variables consistantly upper case and
   with no leading '_'. Many variables that could be local are still
   creating globals.

c) Make all get_* functions names conform to a convention of
   get_<global variable name>, where the <global_variable_name>
   is the global variable set by the function, or whose new
   value is returned by the function.

d) Change _IFS to IFDEVS to be consistant with CDDEVS and DKDEVS,
   and initialize it at the same place.

e) Handle bare '+', '-' in same place other selections are parsed
   rather than in a separate case statement.

f) eliminate '[ "$var" ] || var=value' constructs with ': ${var:=value}'
   constructs.

g) Rename local_sets_dir -> SETSDIR.

h) Rework logic around ftp passwords to eliminate duplications
   and ensure a new password is asked for each time.

i) Some minor cosmetic adjustments.

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