All libraries can be switched off with
./configure --disable-name

This allows testing or removing libraries that are
known to be buggy or problematic.

Notice that when lapack/blas are off, internal versions
are used (plumed does not work without them).

Also notice that when mpi search is on standard mpi compilers
are searched for before non-mpi ones.
Thus, to configure with mpi just type:

./configure

To configure without mpi use:

./configure --disable-mpi

I made this change since mpi is commonly needed and there is no
expected drawback from using mpi.

mostly for testing

Conflicts:
	CHANGES/Unreleased.txt
	user-doc/Installation.txt

Conflicts:
	CHANGES/v2.1.txt

Ready for merge. Nothing should change with existing Makefile.conf.

Now needs PLUMED_INTERNAL_LAPACK/BLAS to use the internal version,
and by default uses external one. This makes it more coherent with
master branch.

Thus:

One can either use external libraries with:

CPPGLAFS=-D__PLUMED_INTERNAL_BLAS -D__PLUMED_INTERNAL_LAPACK

uses internal ones, whereas:

DYNAMIC_LIBS=-lwhatever_appropriate

uses external ones.

I fixed it so that it *Really* works with both internal and external
lapack/blas. The only drawback (I could not do it better) is that
both lapack and blas should be either internal or external.

(thanks to Toni Giorgino)

I fixed a missing include.

Original comment:
Fixes in backup output files - cant rename open file under windows - print reason for failure - remove leak of FILE*s

(cherry picked from commit 448e84fc)

(cherry picked from commit 2c272e4a)

closes #6

(thanks to Toni Giorgino)

I fixed a missing include.

Original comment:
Fixes in backup output files - cant rename open file under windows - print reason for failure - remove leak of FILE*s

Changed the internal enum in switching function (for clarity)

This addresses #43