Add stronger debugging

src/saturnin.sh.skel

     test -n "$SATURNIN_LIBEXEC"        || die "SATURNIN_LIBEXEC is not set"
     test -n "$SATURNIN_LIBEXEC_PREFIX" || die "SATURNIN_LIBEXEC_PREFIX is not set"
     while true; do case $1 in
+        -D|--full-debug) export PRETTY_DEBUG=true
+                        export PRETTY_DEBUG_EXCLUDE=""
+                                                    shift ;;
         -d|--debug)     export PRETTY_DEBUG=true;   shift ;;
         -v|--verbose)   export PRETTY_VERBOSE=true; shift ;;
         -h|--help)      saturnin__help;             exit  ;;
     mkusage "$@"                                            \
             "[options] COMMAND [ARG...]"                    \
         -o                                                  \
+            "-D, --full-debug   turn on gory debugging"     \
             "-d, --debug    turn on debugging"              \
             "-h, --help     show this help message and exit"\
             "-v, --verbose  turn on verbosity"              \

tests/cli/oracle/usage.stderr

   saturnin__usage [options] COMMAND [ARG...]
 
 options:
+  -D, --full-debug   turn on gory debugging
   -d, --debug    turn on debugging
   -h, --help     show this help message and exit
   -v, --verbose  turn on verbosity