(*) Module mathsubs incorporated. Calling Make in lioamber
     should compile this module and link it to lio subroutines,
     so it should be ready for usage.

 (*) Subroutine get_unit removed from dft_get_qm_forces. The
     idea would be to make another module for input and
     output procedures ('iosubs'?)

Squashed commit of the following:

commit 69ff44c7956be9c458f676588a1529c828cffada
Merge: a69d892 38316c8
Author: Francisco <francisco@eneas.(none)>
Date:   Fri Dec 5 12:20:49 2014 -0300

    Merge branch 'master' of ssh://github.com/nanolebrero/lio into auxsubs_branch

commit a69d892f8c73baeacb768dc52669d77496bb5e4f
Author: Francisco <francisco@eneas.(none)>
Date:   Fri Dec 5 12:18:22 2014 -0300

     (*) Module mathsubs has been included in lio. New functions
         and subroutines can be added to it, and can be then used
         inside lio provided the "use mathsubs" is added before
         the variable declaration in the subroutine where you
         want to use the module.

commit 4849a712688a407cec279849304eb1647930d903
Author: Francisco <francisco@eneas.(none)>
Date:   Thu Dec 4 14:52:37 2014 -0300

    Extremely minor modifications on makefile.

commit e40506c5567a5ebdbd10d28907f2f3b16f084dfe
Author: Francisco <francisco@eneas.(none)>
Date:   Thu Dec 4 11:48:58 2014 -0300

     - Change auxsubs name to mathsubs for organizational purposes.
     - Rearranged some stuff in mathsubs's Makefile.
     - Eliminated get_unit subroutine from lio (only used in the file
       dft_get_qm_forces). The idea is to create another module for
       input/output procedures (iosubs?)

commit e125e9d94cfcff7b81671e956f98059c2c4b4378
Merge: f05d0b0 82f1362
Author: Francisco <francisco@eneas.(none)>
Date:   Thu Dec 4 10:28:00 2014 -0300

    Merge branch 'master' of ssh://github.com/nanolebrero/lio into auxsubs_branch

commit f05d0b0301feb2053ae487bc3b1aed74dfada260
Author: Francisco <francisco@eneas.(none)>
Date:   Thu Dec 4 10:26:51 2014 -0300

    Makefile modified to include instructions to compile auxsubs.