The variable `node` shadows the parameter `node`. The access of
`node->first` would not compile, because there is no member `first` in
`priority_queue_t`.

Rename queue to priority queue, because that's what it is.

Closes #1153.

.. but only if there are other authors as well

C++11 requires a space between
literal and identifier [-Wliteral-suffix]

kaspar.schleiser@fu-berlin.de is obsolete.
(2nd try, first try was overwritten by some overzealous documenter)

kaspar.schleiser@fu-berlin.de will be obsoleted soon. Replace it with
kaspar@schleiser.de, which will (hopefully) stay.

This reverts commit 69c526f4.

Instead of removing ENABLE_DEBUG, define it as zero and replacing the
ifdef preprocessor commands by a simple #if

fixed vtimer for the msp430
added spi module for the wsn430 v1.3b
changed some variables to uintXX_t, fixes overflow on msp430