SIMtrace hardware update

Hi all,

unfortunately the number of hardware bugs is quite numerous. for those interested in the details, feel free to read the ticket list in trac.

None of the bugs that I've found so far is too serious for a manual re-work of the prototype. My device is now already enumerating its SAM-BA loader on the USB. JTAG is working, too: I can set the red/green LED via JTAG.

I'll do some further testing (SPI, SIM card interface) as soon as I find time...