fixed conceptional bug in acq_single handling

- information deducted from TCT::acq_single in a std::vector<TCT::acquisition_single> was lost after end of main loop.
- changed acq = AllAcqs[i] into acq* = &AllAcqs(i) and pass the pointer
- changed other methods accordingly
 Changes to be committed:
	modified:   include/acquisition.h
	modified:   src/acquisition.cc
	modified:   src/main.cxx
	modified:   src/measurement.cc