Typo.
Removed unneeded attribution.

As per discussion on the mailing lists, the NOTICE file should retain
only legally important attributions required by upstream sources, not
merely informative atributions.
Added missing Scipy license, moved attribution out of NOTICE file.
Remove minpack from NOTICE, as the full license is in LICENSE.

The license is also already present in the code itself.
Removed Hairer from NOTICE, as the full license is in LICENSE file.

The license is also present in the Gragg-Bulirsch-Stoer integrator
class.
Improved reference to license and notice in the end user documentation.
Removed LAPACK license and notice.

Strangely enough, we do not include any code from LAPACK anymore since
several releases! The last reference was for eigen-decomposition and it
was changed long ago to another implementation.
The only material loosely related to LAPACK are some reference values in
tests which were computed using LAPACK, but these are output of LAPACK
routines, not code from LAPACK routines.