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It seems that sometime on travis a regtest with mw-mpi crashes.

I think this is because when using multiple processors per walker
there is a problem in the opening of the old file (for read) and
its backup (for write). Adding this barrier seems to make it more robust

Properly instantiate templates when using high optimization flags
with gcc

Get_count() should return the number of element
only when used on a Recv status. In this regtests
we were probing the value of a Isend status.

Likely openmpi sets it anyway as the number of
sent element, but this makes mpich2 fail the regtest.

I thus removed the check.

It seems in 865d16c9 I introduced a bug:
checks where reported to travis only when
building doc.

Fixed now

[makedoc]

this is required to avoid name clashes

Now command line shortcuts such as plumed-patch
follow the same rule as plumed executable to set PLUMED_ROOT
as it was implemented in 1b20cb90

Namely, they have an hard coded value that can be replaced
setting the PLUMED_ROOT variable before launching the tool

Sometime there was problem with inconsistent on/off files. Now:

whenever all/none/reset is found, all on/off files are removed.
whenever one module is enabled, on file is added and off file is removed
the opposite when it is disabled

this should enforce consistency of on/off files.

Conflicts:
	src/maketools/update-plumedroot.sh
	user-doc/Installation.txt

Using "_" instead of "-" to avoid clashes.

Actually, the problem was that doing
make install PLUMED_SUFFIX=2
make install
The second install would have canceled the executables installed
by the first install. This is because install assumes names such as
plumed-* to be scripts installed for cross compiling

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There was an error in passing masses from NAMD to PLUMED.

Found by Glen Hocky.

Fixes #162

Now plumed should work if built on a directory which has a space in the path.
Notice that install directory should still not contain spaces.
This is because of some difficulties in making the
src/lib/Makefile rules compatible with names with spaces.

Addresses #157

to doxygen 1.8.7

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Notice that autoconf already implements --enable-openmp.
I removed the one added by hand, so that it does not appear
twice in ./configure --help

Also accepts "manyrestraint+imd" (without colon).

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When MPI was requested and not found configure was erroneously
reporting that PLUMED was compiled with MPI support

\issue{123} to get #123 and a link at the github issue page

\branch{v2.1} to get v2.1 and a link at the github branch page

In 311f3e0b I forgot to rename
the link in Cambridge tutorial

This is necessary because of an internal bug on g++-4.2 on my mac