Including some must-have developments into next release (#285)

* fix issue #274: fits file history update after the section table update (#276)

* Fitzilla completion (#282)

* working #38: some keywords in summary file not null anymore

* added setDefaultLogfile method to CustomLogger interface

* implemented setDefaultLogfile method in CustomLogger component

* working issue #38: other set of keywords are now meaningful

* issue #38: EXPTIME added to the set of keywords that are not null anymore

* closing issue #142: at the end of a schedule the log file is changed to default

* issue #38: updated version and file history

* DiscosVersion Library not compiled when making the system

* fix issue#239: The SINGAL keyword in the main header expanded in order to track the calibration diode status (#278)

* fix issue #239: small bug related to cal noise status fixed

* Fix #283, removed the unnecessary and wrong lines from sardara DataBlock. (#284)