In this manner quotes are not required in -D
making its syntax simpler

This cpp macro allows one to set a default path for the PLUMED_KERNEL.

Useful while patching in macports

I fixed a complain of cppcheck which discourage using
find()==0

This will allow upgrading to latest cppcheck.

useful for macports

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Now works also when plumed has been installed with a different name

- METAD: exit with error if used
- PBMETAD: gives a warning and deactivate the interval for the specific variable
close #181

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I think this fixes #143

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fix a problem when md.log was appended
plumed was trying to write on it after
md.log was already closed

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@alexvoronov pointed out that the example was actually wrong.

same as b2b2176c

Fixes #140

I checked that this regtest fails without last commit

Related to #190

No EOL at the end of the file is only tolerated in input file
(e.g. plumed.dat) and not in other files (including HILLS files).

Indeed, when using multiple walkers, it is possible that transiently
the HILLS file from other walkers have incomplete lines.
With this fix, those lines are ignored and read at the next iteration.

This fixes #190