MAINT: Removed some unused code from ODEPACK

This will reduce the burden of eliminating compiler warnings and
replacing LINPACK calls with LAPACK
MAINT: integrate: Replace DGBFA and DGEFA with DGBTRF and DGETRF
MAINT: integrate: Replace DGESL with DGETRS
MAINT: integrate: Replace DGBSL with DGBTRS
MAINT: integrate: Replace ZGEFA and ZGESL with ZGETRF and ZGETRS
MAINT: integrate: Replace ZGBFA and ZGBSL with ZGBTRF and ZGBTRS
MAINT: integrate: Replace linpack DGTSL with lapack DGTSV
MAINT: Rationalise the numpy.distutils stuff in integrate setup.py

Assuming that lapack_opt will include all BLAS libraries and headers
If this is not the case then the blas_opt info will have to be
added to the libraries, include directories etc.
MAINT: Fix a typo in _odepackmodule.c
MAINT: integrate: Attempt to update the bento stuff for linpack_lite -> LAPACK
BUG: integrate: fix a typo in vode.f
DOC: Add a note to the release notes about the switch from LINPACK to LAPACK
Merge branch 'pr/3971'

review in https://github.com/scipy/scipy/pull/3971 and
https://github.com/scipy/scipy/pull/3916