Added components (transistor and balun) for the uSD variant.

- atusd/Makefile:
- AUTHORS, atusd/Makefile, atusd/dtc123.lib, atusd/dtc123je.fpd: borrowed
  the DTC123 symbol (Alvaro Lopes) and footprint (Dave Ball) from
  gta02-core. Note that this isn't the part I'm using in my prototype, and
  I'm trying to get rid of it entirely, so all this will change before too
  long.
- components/BOOKSHELF, components/INFO, components/balun.lib,
  modules/Makefile, modules/INFO, modules/0805-6.fpd: added the Wuerth
  748421245 balun

makefile

modules/0805-6.fpd

@@ -0,0 +1,59 @@
+/* MACHINE-GENERATED ! */
+
+frame pad {
+	set l = a+0.1mm
+
+	set s = c+0.2mm
+
+	__0: vec @(-l/2, -s/2)
+	__1: vec @(l/2, s/2)
+	pad "$n" __0 .
+}
+
+frame pads {
+	table
+	    { n, x, y }
+	    { 1, 1, 1 }
+	    { 2, 0, 1 }
+	    { 3, -1, 1 }
+	    { 4, -1, -1 }
+	    { 5, 0, -1 }
+	    { 6, 1, -1 }
+
+	set sy = (B-c)/2
+
+	__0: vec @(x*e, y*sy)
+	frame pad .
+}
+
+frame outline {
+	set L = A+2*clear
+
+	set W = B+2*clear+0.4mm
+
+	set clear = 5mil
+
+	set width = 5mil
+
+	__0: vec @(-L/2, -W/2)
+	__1: vec @(L/2, W/2)
+	rect __0 . width
+}
+
+package "0805-6"
+unit mm
+
+table
+    { A, B, a, c, e }
+    { 2mm, 1.25mm, 0.3mm, 0.3mm, 0.65mm }
+
+frame pads @
+frame outline @
+measx pad.__0 -> pad.__1 -1mm
+measy pad.__1 -> pad.__0 1.5mm
+measx pad.__1 -> pad.__0 -1.5mm
+measx pad.__0 >> pad.__1 -1.5mm
+measy pad.__0 -> pad.__1 1.1mm
+measy pad.__0 >> pad.__1 1.5mm
+measx outline.__0 >> outline.__1 -1.5mm
+measy outline.__0 >> outline.__1 1.5mm

modules/INFO

@@ -47,3 +47,6 @@ N: nx3225sa
 
 # Solder pads and test points
 F: pads
+
+# 0805 package with six pads
+F: 0805-6

modules/Makefile

@@ -1,4 +1,4 @@
-MODULES=meander mini-usb pads qfn qfp stdpass xtal-4
+MODULES=0805-6 meander mini-usb pads qfn qfp stdpass xtal-4
 
 .SUFFIXES:	.fpd .mod
 .PHONY:		all clean