Update before summer holidays.

applications/lofar2/doc/prestudy/desp_howtools_erko.txt

...cations/lofar2/doc/prestudy/station2_sdp_deliverables.txt

applications/lofar2/doc/prestudy/station2_sdp_dsp.txt

...ions/lofar2/doc/prestudy/station2_sdp_firmware_design.txt

...ns/lofar2/doc/prestudy/station2_sdp_firmware_planning.txt

applications/lofar2/doc/prestudy/station2_sdp_icd.txt

applications/lofar2/doc/prestudy/station2_sdp_m_and_c.txt

applications/lofar2/doc/prestudy/station2_sdp_srs.txt