more cleanup and documentation

lib/pcb_pad.scad

@@ -1,16 +1,38 @@
 /*
-    pcb_pad(pads = 1, style = "round")
+    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
 
+    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: pcb_pad
+    DESCRIPTION: single row pcb pad
+           TODO: none
+
+          USAGE: pcb_pad(pads = 1, style = "round")
+
+                           pads = # pads
+                          style = "round", "square"
 */
 
-// single row pcb pad
 module pcb_pad(pads = 1, style = "round") {
 
     adjust = .01;
     $fn = 90;
     pad_size = 1.25;
     size_y = 2.54;
-    size_x = 2.54 * (pads-1);                
+    size_x = 2.54 * (pads-1);
     union() {
         for (i=[0:2.54:size_x]) {
             if(style == "round") {