Consistent weights for weighted and nonweighted RMSD TYPE=OPTIMAL
sum_hills has a default --bin set to 50
INTERVAL KEYWORDS for monodimensional METAD, they works
also with grid but without splines (automatically deactivated).
reworked a bit the way in which INTERVAL is initialized
and added the doxygen part
AlphaBeta Multicolvar
regtest for alphabeta
wrong sign in the derivatives of alphabeta
update the How to move your input tutorial
to reflect the implementatin of INTERVAL and ALPHABETA
Added documentation to alphabeta
gro format updated in driver
some regtest were broken. Now resetted

Note: the default bin calculation is reintroduced in sum_hills not to break the test
few changes in Driver to get it compiled with icpc on our cluster
Made fast RMSD the default when possible (align==displace)
Added patch for gromacs 4.6.2
Hid NL_STRIDE option in SecondaryStructure
CS2Backbone improvements:

- solved a bug with averaging over parallelized replicas
- more documentation
Merge branch 'v2.0' of git.assembla.com:plumed2 into v2.0
CSBackbone - more documentation
CS2Backbone: a lot of more documentation
cs2back gromacs example