src/linreg_lapack: Change indentation
Trying to create C++ wrapper to dgels/dgelsy (LAPACK)
calc_rss_lapack: not working at all

 - don't know how to grab double * from NumericMatrix
calc_rss_lapack: I think I've fixed it in the full rank case

 - but I still don't totally understand how, and I think it may be
   inefficient.  It's certainly _ugly_!
Modify ToDo list [skip ci]
Lapack tests now use c++-based calls

 - not working in reduced-rank case
Cosmetic changes to lin regr tests
Fixed the bug in calc_rss_lapack
Remove the C-based lapack routines as c++ version works

 - Also update the vignette