Magic tools (and tp-magic-config) supports local (user) plugins.

Added copyright & credit info to new Magic tool plugin .c files.
Updated Magic plugin doc API.

src/tp-magic-config.sh.in

@@ -50,10 +50,18 @@ if [ $# -ne 0 ]; then
     echo "__DATAPREFIX__"
     exit
   fi
+  if [ $1 = "--localdataprefix" ]; then
+    echo "$HOME/.tuxpaint/plugins/data"
+    exit
+  fi
   if [ $1 = "--pluginprefix" ]; then
     echo "__PLUGINPREFIX__"
     exit
   fi
+  if [ $1 = "--localpluginprefix" ]; then
+    echo "$HOME/.tuxpaint/plugins"
+    exit
+  fi
   if [ $1 = "--plugindocprefix" ]; then
     echo "__PLUGINDOCPREFIX__"
     exit