code cleanup, rearrangement and documentation

mod/place.scad

@@ -1,11 +1,31 @@
 /*
+    This file is part of SBC Case Builder https://github.com/hominoids/SBC_Case_Builder
+    Copyright 2022,2023,2024 Edward A. Kisiel hominoid@cablemi.com
 
-    place(x,y,z,size_x,size_y,rotation,side)
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>
+    Code released under GPLv3: http://www.gnu.org/licenses/gpl.html
+
+
+           NAME: place
+    DESCRIPTION: transformation to place objects on either side of a geometric plane of a given thickness
+           TODO: none
+
+          USAGE: place(x, y, z, size_x, size_y, rotation, side)
 
 */
 
 /* placement module *must be first* for children() */
-module place(x,y,z,size_x,size_y,rotation,side) {
+module place(x, y, z, size_x, size_y, rotation, side) {
 
     if (side == "top") {
         if (rotation == 0 || rotation == 90 || rotation == 180 || rotation == 270) {