Resolve "Man pages"

Closes #36 (closed)

inc/lektor/cmd.h

@@ -16,12 +16,12 @@ typedef void (*lkt_cmd_callback)(struct lkt_cmd_args *);
 struct lkt_cmd_opt {
     const char *name;
     lkt_cmd_callback call;
-    const char *help;
-    struct lkt_cmd_opt *sub;
 };
 
 /* Parse the command line with the list of options. No parameter may be NULL.
    Does not return. */
-noreturn void lkt_cmd_parse(struct lkt_cmd_opt *opts, int argc, const char **argv, void (*help)(void));
+noreturn void lkt_cmd_parse(struct lkt_cmd_opt *opts, int argc, const char **argv);
 
-void lkt_cmd_help(struct lkt_cmd_opt *opts, const char *name);
+/* Must be setted for the lkt_cmd_parse function to display the correct help
+   in case of errors. */
+extern const char *executable_name;