shell: print command if not found
shell: fixup test_shell expect scripts
shell: fix newlines
x86: add read-before-write check at runtime

Finding read-before-writes statically is quite difficult. In native we
can use valgrind, but on boards without an MMU we are out of luck.

x86 has an MMU, let's use it.

If `-DDEBUG_READ_BEFORE_WRITE` was set, then pages on the heap get
initialized upon first use. If the page was read before written, then a
debug message with the virtual and physical address of the memory
location is printed, as well as the address of the offending instruction.
you can never have enough debugging in RPL
some minor fixes and debugging
set correct transceiver stack size for debugging
fixed debugging for cc110x
net: IPv6: RPL: more debug output
rpl: debug: use DEBUGF where necessary
drivers: added rgbled driver
x86: add proper terminal for qemu-i386

This includes GNU readline features and debugging.

Build with `make BOARD=qemu-i386 all-debug`.
Run with `make BOARD=qemu-i386 term`.

Debug with `make BOARD=qemu-i386 debug`. The default debugger is `gdb`.
Also supported are `debug-tui` (GDB Text User Interface), `debug-kdbg`,
and `debug-ddd`. Set a breakpoint in e.g. "startup" or "main", and
hit/write "continue".

The debugger can only run with a quite new toolchain (e.g. Debian
testing). Ubuntu 13.10. for example will likely report a crash in GDB
when switching from 16bit code to 32bit code.
x86: garbage collect section if not debugging
cc110x_ng: build cc110x_spi for all boards except chronos
Merge pull request #1310 from phiros/avsextrem_allow_use_of_cc110x_ng_driver

cc110x_ng: build cc110x_spi for avsextrem (bugfix)
Merge pull request #891 from OlegHahm/rpl_debug

net: some debug code
Merge pull request #1105 from Kijewski/shell-print-not-found

shell: print command if not found
Merge pull request #1257 from Kijewski/shell-fix-newline

shell: fix newlines
Merge pull request #1259 from Kijewski/x86-heap-check

x86: add read-before-write check at runtime
Merge pull request #1316 from haukepetersen/add_driver_rgbled

drivers: added rgbled driver