Merge MAC-CS1-branch with HEAD.

Fix some minor bugs in the RegisterState class. Now the state of all
registers is properly reported.

New registerstate state machine.

Implemented new defintion and behaviour of RegisterState states.

Add new images. These run at 196 MHz.

New version 4.2 images for AP and BP

Introducing new AllRegisterState register to keep track of the update status of
all hardware registers.

Introduced RegisterState for SS, SST, BST, XST and RSR registers.

Always send beamformer weights every second

prevent division by zero exception

Remove unused constants.

Make range slightly larger to fit data

Extract cross-correlations from registers by reading with appropriate stride and at appropriate offset.

Use NrBlps instead of NrRcus / N_POL

Replace tabs by spaces.
Move WRITE_BS to execute early.

Size of cross correlation stats register is dependent on number of configured BLPs

weights for cross-correlation were not written correctly

Write BS register unconditionally.
Write in Hz not MHz!

New startdaemon that starts executable in stead of tasks.

Handle EINTR and EAGAIN from time_pps_fetch in new method ::fetchPPS().

Use StationSettings where we can.

Redesign of Main Control Unit software.

Correct settings for output to lofar11 and lofar12

only set BS register when all input to BS has stopped at some point in time
WG = off, and RCUs = off

single clock settings for all boards

rename clock related events from plural to singular

rename clock related events

Rename clock related events.

Only one clock settings allowed for the whole station.

Remove unused constants.
Remove initial clear of RSP board since it doesn't work anyway and the
board should be initialized properly by the higher level software anyway.

Add new CEP and LCU registers.

Some registers are no longer read in multiple chunks. Update for it.

Update for 4.2 version of MEP protocol.

Changed order in which registers are read/written to make sure all BP (board processor)
register are read/written before the AP (antenna processor) registers.

cleaned up status output

Each XST register is now < 1500 bytes so it can be read in one message, but
there are not 32 cross correlation registers.

Support subscribing on slices of the cross correlation matrix.

Keep modified state of beamformer weights registers.

Add new cross correlation registers.
Change routing of beamformer register signals.

RCUSettingsState is per RCU now instead of per BLP/AP.