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

components/INFO

@@ -25,3 +25,6 @@ N: nx3225sa
 
 # Generic antenna with ground on pin 1, feed on pin 2
 S: antenna
+
+# Typical SMT balun configuration
+S: balun

components/balun.lib

@@ -0,0 +1,34 @@
+EESchema-LIBRARY Version 2.3  Date: Thu Sep  2 15:10:08 2010
+#
+# BALUN
+#
+DEF BALUN B 0 40 Y Y 1 F N
+F0 "B" -300 350 60 H V C CNN
+F1 "BALUN" -200 -350 60 H V C CNN
+DRAW
+T 0 -250 -250 50 0 0 0 GND  Normal 0 C C
+A -100 -149 49 900 -11 0 1 0 N -100 -100 -50 -150
+A -100 -49 49 900 -11 0 1 0 N -100 0 -50 -50
+A -100 51 49 900 -11 0 1 0 N -100 100 -50 50
+A -100 151 49 900 -11 0 1 0 N -100 200 -50 150
+A -99 -150 49 0 -911 0 1 0 N -50 -150 -100 -200
+A -99 -50 49 0 -911 0 1 0 N -50 -50 -100 -100
+A -99 50 49 0 -911 0 1 0 N -50 50 -100 0
+A -99 150 49 0 -911 0 1 0 N -50 150 -100 100
+A 99 -150 49 1800 -888 0 1 0 N 50 -150 100 -200
+A 99 -50 49 1800 -888 0 1 0 N 50 -50 100 -100
+A 99 50 49 1800 -888 0 1 0 N 50 50 100 0
+A 99 150 49 1800 -888 0 1 0 N 50 150 100 100
+A 100 -149 49 900 -1788 0 1 0 N 100 -100 50 -150
+A 100 -49 49 900 -1788 0 1 0 N 100 0 50 -50
+A 100 51 49 900 -1788 0 1 0 N 100 100 50 50
+A 100 151 49 900 -1788 0 1 0 N 100 200 50 150
+X ~ 1 -400 200 300 R 50 50 1 1 P
+X ~ 2 400 0 300 L 50 50 1 1 W
+X ~ 3 400 200 300 L 50 50 1 1 P
+X ~ 4 400 -200 300 L 50 50 1 1 P
+X ~ 5 -400 -200 300 R 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library