Converted PSlice,PSpec,PCurve to unique_ptr;

pub/lib/curve.cpp

pub/lib/edif.cpp

pub/lib/file_in.cpp

pub/lib/file_out.cpp

pub/lib/fit.cpp

pub/lib/import.cpp

pub/lib/manip.cpp

pub/lib/mem.cpp

pub/lib/node.cpp

pub/lib/olf.cpp

pub/lib/olf.hpp

pub/lib/opr.cpp

pub/lib/plot.cpp

pub/lib/ptr.hpp

pub/lib/rssm.cpp

pub/lib/special.cpp