This requires a few fixes:
- Replace -ansi with -std=c++11 in autoconf.
- Add a check that c++11 is supported in autoconf.
- Change flags for cppcheck.
- Remove travis configurations that would fail.

Additionally, I removed the check for 'explicit' keyword,
which is not needed with C++11.

Fixes #212

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Actually this should have been done together with 21be029e

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This regtest can be used to test if it is possible to
catch exceptions raised in plumed

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this is to test FIT_TO_TEMPLATE with TYPE=OPTIMAL and
domain decomposition (see #214)

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This is a nasty workaround. Since FIT_TO_TEMPLATE needs to
access forces stored in Atoms, it is necessary that they are kept up
to date. With this fix, there is an extra function
allowToAccessGlobalForces()
that switch off an optimization that would otherwise make the
forces wrong when running in parallel

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(thanks to @valsson)

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