Added a config option for an alternative updates path for data files.

This is the full path to the directory, a trailing "/" will be
added if needed.  The path does not have to be within the el config
tree so long as you have read access.  The path is configurable from
the server tab of options.

elconfig.c

@@ -3156,6 +3156,7 @@ static void init_ELC_vars(void)
 		SERVER);
 	add_var(OPT_BOOL,"write_ini_on_exit", "wini", &write_ini_on_exit, change_var, 1,"Save INI","Save options when you quit",SERVER);
 	add_var(OPT_STRING,"data_dir","dir",datadir,change_dir_name,90,"Data Directory","Place were we keep our data. Can only be changed with a Client restart.",SERVER);
+	add_var(OPT_STRING,"alt_updates_dir","aupdir",alt_updates_dir,change_dir_name,90,"Alt Updates Directory","Full path to an alternative updates directory for data files.  Normally blank.",SERVER);
 #endif // ANDROID
 	add_var(OPT_BOOL,"serverpopup","spu",&use_server_pop_win,change_var,1,"Use Special Text Window","Toggles whether server messages from channel 255 are displayed in a pop up window.",SERVER);
 	/* Note: We don't take any action on the already-running thread, as that wouldn't necessarily be good. */

init.c

@@ -113,6 +113,8 @@ char datadir[256]=DATA_DIR;
 char datadir[256]="./";
 #endif //DATA_DIR
 
+char alt_updates_dir[256]="";
+
 static const char *cfg_filename = "el.cfg";
 #ifdef JSON_FILES
 static const char *client_state_filename = "client_state.json";

init.h

@@ -251,6 +251,7 @@ typedef struct
 
 extern char configdir[256]; /*!< the default directory where we look for configuration files */
 extern char datadir[256]; /*!< the default directory where we look for data files (aka installation dir) */
+extern char alt_updates_dir[256]; /*!< an alternative updates directory for data files, if blank, default is <config base>/updates/<version> */
 
 /*!
  * \ingroup loadsave

io/elpathwrapper.c

@@ -192,7 +192,10 @@ const char * get_path_updates(void)
 		return locbuffer;
 	}
 
-	safe_snprintf(locbuffer, sizeof(locbuffer), "%supdates/%d_%d_%d/", get_path_config_base(), VER_MAJOR, VER_MINOR, VER_RELEASE);
+	if (alt_updates_dir[0] != '\0')
+		safe_snprintf(locbuffer, sizeof(locbuffer), "%s", alt_updates_dir);
+	else
+		safe_snprintf(locbuffer, sizeof(locbuffer), "%supdates/%d_%d_%d/", get_path_config_base(), VER_MAJOR, VER_MINOR, VER_RELEASE);
 
 	return locbuffer;
 }