Reformat _saturnin__conf_usage() to 79 character width

As recommended by Shaturnin style guide:

    https://github.com/AloisMahdal/shellfu/blob/master/notes/style.md

src/saturnin.sh.skel

     # Show usage message and exit
     #
     PRETTY_USAGE="self=${0##*/} conf" \
-    mkusage "$@"                                                               \
-            "[options] [-e] SECTION.KEY [FNAME]"                               \
-            "[options] -r SECTION.KEY [FNAME]"                                 \
-            "[options] -K SECTION [FNAME]"                                     \
-            "[options] -P FNAME"                                               \
-            "[options] -S FNAME"                                               \
-        --                                                                     \
-            "Use inigrep to query config files."                               \
-        -o                                                                     \
-            "-j     join all files before applying query"                      \
-            "-1     ensure single line is returned"                            \
-        -c                                                                     \
-            "-e     use normal mode (default)"                                 \
-            "-r     use raw mode (preserves RHS whitespace and some comments)" \
-            "-K     list available keys in SECTION"                            \
-            "-S     list available sections in FNAME"                          \
-            "-P     list available keypaths (SECTION.KEY) in FNAME"            \
-        --                                                                     \
-            "FNAME is filename, which is then searched on all paths specified" \
-            "in SATURNIN_CONF_PATH and depending on -j parameter, first one"   \
-            "wins or all are joined.  If FNAME contains slash, this search is" \
-            "not done and FNAME is taken as path to file that is then queried."\
-            ""                                                                 \
-            "If FNAME is omitted, it is inferred from SECTION (e.g. .'foo.ini'"\
-            "if 'foo.bar' was section name; note that section name may contain"\
-            "dot)."
+    mkusage "$@"                                                              \
+            "[options] [-e] SECTION.KEY [FNAME]"                              \
+            "[options] -r SECTION.KEY [FNAME]"                                \
+            "[options] -K SECTION [FNAME]"                                    \
+            "[options] -P FNAME"                                              \
+            "[options] -S FNAME"                                              \
+        --                                                                    \
+            "Use inigrep to query config files."                              \
+        -o                                                                    \
+            "-j     join all files before applying query"                     \
+            "-1     ensure single line is returned"                           \
+        -c                                                                    \
+            "-e     use normal mode (default)"                                \
+            "-r     use raw mode (preserves RHS whitespace and some comments)"\
+            "-K     list available keys in SECTION"                           \
+            "-S     list available sections in FNAME"                         \
+            "-P     list available keypaths (SECTION.KEY) in FNAME"           \
+        --                                                                    \
+            "FNAME is filename, which is then searched on all paths specified"\
+            "in SATURNIN_CONF_PATH and depending on -j parameter, first one"  \
+            "wins or all are joined.  If FNAME contains slash, this search is"\
+            "not done and FNAME is taken as path to file that is then"        \
+            "queried."                                                        \
+            ""                                                                \
+            "If FNAME is omitted, it is inferred from SECTION (e.g. 'foo.ini'"\
+            "if 'foo.bar' was section name; note that section name itself may"\
+            "contain dot)."
 }
 
 _saturnin__nl2colon() {