Modification history of drsdaq program
--------------------------------------

23/3/2009   Changed 'Events' entry in run header. It now gives the number of
    	    events in the current file.
24/3/2009   Copied into FACT subversion directory. Updated location of
    	    configuration file and PixelMap.txt (in config/ in repository).
	    Improved PrintMessage() and error outputs.
26/3/2009   Added PixelMap translation to communication with HV control.
30/3/2009   Added feedback gain. Checked into repository.
1/4/2009    Changed many 'char *' to 'const char *' to honour compiler warning
            on ihp-pc26 (newer version of g++ than on eth-vme02)
2/4/2009    Introduced check for magic number in RawDataCTX.cc
3/4/2009    Added frequency and scale factor transmission to socket protocol
6/4/2009    Allowed reading of data via read command also while DAQ is active.
22/4/2009   Included sizes of RunHeader, EventHeader and BoardStructure in
    	    RunHeader and changed some data widths in RunHeader to U32 to
	    increase compatibility with Magic raw data format. Unique run
	    numbers are now generated using the file LastRunNumber.
28/4/2009   Raw file writing uses now writev() and is changed entirely to
    	    Linux system calls instead of C++ library functions. Introduced
	    new magic number that indicates an error while writing. More
	    extensive error checking for I/O functions. Requesting zero events
	    will let run go until stopped manually. Feedback writes slow data.
29/4/2009   DAQ writes run summary to slow data file.
14/5/2009   Streamlined raw data format.
18/5/2009   Included some version and size checking in RawDataCTX.cc.
19/5/2009   Subversion revision number included in run header. Added human readable
    	    date and time to slow data.
28/5/2009   Replaced NCMCBoards by NBoards for clarity. Added line editing
    	    capability with the readline library.
29/5/2009   Number of lines in log file limited to configurable number.
4/6/2009    Config file can contain array of numbers. Reading of config file now
    	    safe for buffer overflow. RawDataCTX class take the possibility of
	    varying event data size into account.
12/6/2009   Trigger cells (determined using DRS class GetTriggerCell()) are
    	    stored as array of integers in event data. RawDataCTX class pointer
	    'Data' changed from short* to char*.
16/6/2009   Data is not rotated by copying in memory, but by saving to disk in
    	    correct order using writev() (10% gain in rate)
18/6/2009   Run date is now calculated with a change to the next date on 13:00 UTC.
9/7/2009    SlowData class is now independet of PrintMessage() method, thus more
	    universal
14/7/2009   Fixed assignment of trigger type in event header (now 0  is hardware
    	    trigger, 1 software trigger). Fixed pointer-arithmetic for trigger cell
	    writing if first board written to disk is not physically first board.	    
28/7/2009   Added configuration parameters SlowDataPath and DefaultFrequency. All
    	    configuration parameters are now mandatory: if one is not found, the
	    program terminates.