Optimiser: Additional expression for #peaks (~ #turns)

modified:   optimizer/Drivers/pisa-opal/pisa-opal.cpp
modified:   optimizer/Expression/CMakeLists.txt
new file:   optimizer/Expression/NumberOfPeaks.cpp
new file:   optimizer/Expression/NumberOfPeaks.h
modified:   optimizer/Util/PeakReader.cpp
modified:   optimizer/Util/PeakReader.h
modified:   src/Optimize/OptimizeCmd.cpp