sgdgmf.rank : changed default method from
"onatski" to "evr" methodeigengap.evr (new function) : implemented the
eigenvalue ratio method for rank selectioneigengap.onatski : fixed bug occurring when no optimal
rank can be selectedCXXFLAGS = $(CXXFLAGS) -Os to
Makevars and Makevars.win files to optimize
the memory space usad by compiled C++ files