[makedoc]

Related to #183

This barrier is apparently useless since it comes
just before a Bcast.

Anyway, it looks like it is solving an issue that appeared on
TRAVIS (at least on my laptop) so I add it here.

Related to #183

[makedoc]

This regtest is failing on travis from time to time, in an
irreproducible way. I took note of the problem at issue #183

I temporarily change this regtest by:
1. moving COLVAR.reference to COLVAR.reference.dontcheck
2. adding HILLS.reference so that at least one file is checked.

Notice that this is not a solution of the problem, just a way
to avoid random failures on travis.

As soon as someone is willing to fix this, just put COLVAR.reference
back in place and push it to travis

[makedoc]

Before this fix, using cmd() with an erroneous string was triggering
no error. Now this is fixed.

Notice that this is an old bug (introduced in 0a46f15d).
It should be harmless when using MD codes with proper interfaces,
but could be very dangerous if there is a typo in a cmd string.

now remove trailing "/" which could lead to troubles in "#ifdef"

[makedoc]

[makedoc]

[makedoc]

[makedoc]

[makedoc]

[makedoc]

goes with 5646e0ba

[makedoc]