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When there are zero atoms in one of the DD domains,
some arrays are allocated to be zero sized and later
accessed with &array[0].

Whereas this is harmless, it triggers an out-of-boundary
error when plumed is compiled with --enable-debug-glibcxx

The size of those arrays is now guaranteed to be at least 1.

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When using METAD with file-based multiple walkers and many processes
launched with mpirun (e.g. with gromacs -multi) replica suffix is
not added to grid file.

(see also 667da1b3)

Contributed by Marco De La Pierre

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This now allows the following things:
- include the bias applied by PLUMED in the LAMMPS total energy
- allows for multiple walkers using MPI

This patch was provided by @PabloPiaggi

This reverts commit 564bd00f.

(useless)

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When making mistakes such as
STRIDE=2.5
or
COORDINATION NN=6.5
It gives an error instead of using the default values.

This fixes #104

This finds a keyword in a list without erasing it.