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clean up msp430 cpu-conf.h
fix main return for msp430

mspgcc handles main specially, this introduces code to make main
behave normally
stack alignment workaround

Should be fixed in thread.c instead, this is just a temporary
workaround to enable msp-430 threads in the mean time.
improve programmer handling in msb-430-common
msp430 lpm stub
add some documentation to lpm.h
remove suprerfluous thread_yield declaration
Merge pull request #446 from LudwigOrtmann/msp

fixes for msp430, msb-430 and msb-430-common