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I added an empty examples section.

@carlocamilloni you might want to add real examples.

in cppcheck job, actually run make codecheck

maketools/cppcheck has been renamed into maketools/codecheck

To use it:
make cppcheck only runs cppcheck
make plumedcheck only runs plumedcheck
make codecheck runs both and aggregate messages (to be used e.g. on travis)

I added a awk script src/maketools/plumedcheck
that works similarly to cppcheck. It takes as argument
a list of files and analyze them.

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gaussian with grids, the check for sigma_min and
grid was not working properly

regtest reset

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