modulecmd: set defaults for DefaultGroups, etc

- defaults are set for DefaultsGroups, DefaultReleaseStages and ReleaseStages

Pmodules/modulecmd.bash.in

@@ -60,11 +60,29 @@ declare -A Help
 
 declare -r pmodules_config_file="${PMODULES_ROOT}/${PMODULES_CONFIG_DIR}/Pmodules.conf"
 
+# the following settings are used if the Pmodules.conf is not available
+
+# set groups which should be available after initialization
+declare -- DefaultGroups='Tools Programming'
+
+# define available release stages
+declare -- ReleaseStages=':unstable:stable:deprecated:'
+
+# set releases which should be available after initialization
+declare -- DefaultReleaseStages='stable'
+
+# In the dictionary Help we store the help text of each single command
+# and for displaying the version.
+
+# initialize help text of 'module --version'
 Help['version']="
 Pmodules @PMODULES_VERSION@ using Tcl Environment Modules @MODULES_VERSION@
 Copyright GNU GPL v2
 "
 
+#
+# display help text for command given in $1
+#
 print_help() {
         echo -e "${Help[$1]}" 1>&2
         std::die 1