Also tidied up how STRIDE and USE_ALL_DATA works for analysis
objects.  Now everything works in a manner similar to GRID

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this helps when using many Cvs
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and removed NOPBC keyword

See #200

and removed NOPBC keyword

See #200

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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

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.

I merged the implementations for different types
using template functions

LOAD FILE=xx.cpp was not working correctly if xx.cpp needs to access
to libraries

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(the compiler couldn use them)

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