rm myexception, further clean up

src/asi.cpp

src/curve.cpp

src/edif.cpp

src/expr.cpp

src/file_io.cpp

src/frida2.cpp

src/func.cpp

src/gar.cpp

src/gar.h

src/index.cpp

src/index.h

src/list.cpp

src/manip.cpp

src/myexception.h

src/olm.h

src/r-temp.cpp

src/range.cpp

src/range.h

src/rng.cpp

src/rssm.cpp