Merged changes from trunk

* r3967: afterburner: added support for CDO option -s
* r3966: afterburner: use input file format for output if obsolate namelist parameter FORMAT is not used
* r3965: Changed aexpr(f) operators to be fully functional. Memory management should be revisited.
* r3963: Afterburner: added docu
* r3962: Afterburner: added docu
* r3961: Added test/Afterburner.test
* r3960: afterburner: added process stat
* r3959: afterburner: added support for output pipes
* r3958: afterburner: added support for output pipes
* r3957: afterburnerlib: replaced streamWriteVar by streamWriteRecord
* r3956: afterburner: added support for cdo option -v (verbose)
* r3955: after_fctrans.c update
* r3954: added new operator: after - ECHAM afterburner
* r3953: afterburnerlib.c update
* r3952: added parameter2intlist to check parameter lists
* r3951: Remap: abort for unsupported target grid type - generic
* r3950: afterburnerlib update
* r3949: afterburnerlib: update
* r3948: Derivepar: use MakeGeopotHeight() from afterburnerlib
* r3947: added afterburnerlib.c
* r3946: added after_dvtrans.c
* r3945: after_sptrans.c: moved called to jspleg1()
* r3944: after_legini update + cleanup
* r3943: Gridcell.c: include constants.h
* r3942: Derivepar.c: include constants.h
* r3941: Vargen.c: include constants.h
* r3940: Vertintml.c: include constants.h
* r3939: specspace.c: include constants.h
* r3938: after_sptrans.c: include constants.h
* r3937: after_vertint update
* r3936: added constants.c and constants.h
* r3935: renamed legini to after_legini and moved to after_sptrans.c
* r3934: history.c: added static to static functions