Replace C sort algorithms with std::sort solutions.

Merge branch 'master' of gitlab.psi.ch:OPAL/src into 318-optimizer-generalizing-objectives-with-sddsvariableat

throw error if optimizer expression parser doesn't return successfully or if not whole expression has been parsed

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