UPDATE:

the installation and configuration of the SciFor library has been deeply updated.

The /etc/library.conf file contains different information now.
Lapack/Blas library are mandatory.
The presence of other available libraries is indicated through different boolean variables
which are used at compilation time of the library to set pre-compilation flags and
include or not routines or functions which use such libraries.

Other available libraries can be added to the system to ease coding, though these are
not strictly speaking necessary to compile SciFor.

- MINPACK in OPTIMIZE_ROOT_FINDING is now under pre-compilation flag
- QUADPACK has been completely removed (in src/.repo), new routines which
used QUADPACK ones will be subject to pre-compilation flag.

Other minor changes have been performed.