Tidy up variable setting code

 *  Add docstring,
 *  add explanations for local variable names,
 *  separate export declarations,
 *  sort globals alphabetically,
 *  add built part delimiters,
 *  quote paths properly.

src/bin/saturnin.skel

@@ -2,22 +2,39 @@
 
 . $(ffoom path) || exit 3
 
+#
+# =====BEGIN BUILT PART=====
+#
+
 mkconfpath() {
-    local userd="__SATURNIN_CONFIG_USER__/ini.d"
-    local user="__SATURNIN_CONFIG_USER__"
-    local lcal="__SATURNIN_CONFIG_LOCAL__"
-    local distd="__SATURNIN_SHARE__/ini.d"
+    #
+    # Assemble list of config paths for FFOO_CONFIG_PATH (path per line)
+    #
+    local userd     # user'd modular config (~/.xyz/ini.d)
+    local user      # user's generic config
+    local lcal      # local admin provided config
+    local distd     # distribution-provided config (always modular)
+    userd="__SATURNIN_CONFIG_USER__/ini.d"
+    user="__SATURNIN_CONFIG_USER__"
+    lcal="__SATURNIN_CONFIG_LOCAL__"
+    distd="__SATURNIN_SHARE__/ini.d"
     test -d "$userd" && find -L "$userd" -mindepth 1 -maxdepth 1 -type d
     echo "$user"
     echo "$lcal"
     test -d "$distd" && find -L "$distd" -mindepth 1 -maxdepth 1 -type d
 }
 
-export FFOO_PATH="__SATURNIN_FFOO_DIR__"
+export FFOO_PATH FFOO_CONFIG_PATH SATURNIN_VERSION SATURNIN_CACHE_HOME
+
+FFOO_CONFIG_PATH="$(mkconfpath | tr '\n' :)"
+FFOO_PATH="__SATURNIN_FFOO_DIR__"
+SATURNIN_CACHE_HOME="__SATURNIN_CACHE_HOME__"
 SATURNIN_LIBEXEC="__SATURNIN_LIBEXEC__"
-export FFOO_CONFIG_PATH=$(mkconfpath | tr '\n' :)
-export SATURNIN_VERSION="__VERSION__"
-export SATURNIN_CACHE_HOME="__SATURNIN_CACHE_HOME__"
+SATURNIN_VERSION="__VERSION__"
+
+#
+# =====END BUILT PART=====
+#
 
 ffoo import config
 ffoo import exits