ipc_pingpong: start receiving thread immediately

Rationale: When using `msg_send_receive()` the receiving thread needs to
be already in receiving mode.
net: destiny: renamed internal TCP enums

Rationale: LISTEN was used in MSP430-Lib for the USART.
cosmetics
net: destiny: fixed typo and further cleanups
Merge pull request #898 from OlegHahm/rename_tcp_socket_enums

net: destiny: renamed internal TCP enums
make: clean msb-430-common Makefile.include

set default values with `?=`
automatically add `PORT` for `PROGRAMMER == uif`
Merge pull request #907 from OlegHahm/ipc_pingpong_fix

ipc_pingpong: start receiving thread immediately
Merge pull request #908 from LudwigOrtmann/make_msb-430-common_programmer

make: clean msb-430-common Makefile.include