- Loading of GSL that is part of MSYS2 on Windows

- Removed dependency on Osicat library

- Enable loading of GSL 2.0 by fixing a bit of code in nonlinear least squares fitter.

- Disabled loading of basis-spline.lisp

- Cosmetic fixes.

I could not figure out the problem with basis-spline.  I thus removed it.  There may be a much better solution than that.

I checked the above on latest CCL and SBCL on Windows 7.

Warning: the two commits required some git surgery (splitting a commit into two).  I hope that I did not introduce additional problems with the splits.  

For Antik I am attaching one patch that fixes the readtable problem on CCL:

(named-readtables:defreadtable :antik

  (:merge :standard)

  #-ccl(:macro-char #\# :dispatch))

Without the patch all #... reader macros (CL and Antik) were deleted.  With this patch both CL and Antik's reader macros work in CCL.  I also tried the patch with SBCL, and I don't see a need for it.  But since the macro-char redefinition did not hurt in SBCL, I left it in.

Mirko