libs: made error message clearer and more consistent

lib/zzz_main_fct.sh

@@ -16,7 +16,7 @@ read_commandline()
 {
     syntax_error()
     {
-        prnt E "Error while analysing command line, please check your parameters."
+        prnt E "Error while analysing command line parameters."
         die 1 --force
     }
 
@@ -52,9 +52,9 @@ read_commandline()
                 if [[ -s $STAGE_FILE ]]; then
                     export RESUME=true
                 else
-                    prnt E "The state file doesn't exists or is empty!"
+                    prnt E "The status file doesn't exists or is empty!"
                     prnt E "Without it, resuming is impossible."
-                    die 1 --force
+                    die 17 --force
                 fi
                 ;;
             "-R"|"--no-root-check")
@@ -102,7 +102,7 @@ read_commandline()
                         export NEW_LOGFILE=$opt
                         want_logfile=false
                     else
-                        prnt E "It's impossible to specify several log files."
+                        prnt E "Impossible to specify several log files."
                         die 1 --force
                     fi
                 elif [[ $want_conffile == true ]]; then