[patch] cleanup lapack options in configure

[Jules Bergmann]

This patch cleans up the lapack options in configure.

 From the user point of view, it merges the --enable-lapack and 
--with-lapack options together:

  - by default, use of LAPACK is not enabled

  - "--with-lapack" enables searching for a lapack library

  - "--with-lapack=PKG" enable search for a specific lapack
    library.  I.e. --with-lapack=mkl searchs for MKL.  The
    choices are mkl, atlas, generic, and builtin.

    Power users can specify multiple libraries to search for.
    For example:

	--with-lapack="generic mkl atlas"

The consideration of the builtin ATLAS is controlled by the 
--enable-builtin-atlas option.  By default, "--with-lapack" is 
equivalent to --with-lapack="atlas generic builtin".  However, if 
"--disable-builtin-atlas" is given, then it is equivalent to 
--with-lapack="atlas generic".

Internally, the handling of '--with-mkl-prefix' and 
'--with-atlas-prefix' (which imply --with-lapack=mkl and 
--with-lapack=atlas) is cleaned up.

				-- Jules
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