removed a number of warning about int/unsigned comparison
CH3Shifts: methyl groups chemical shifts
CS2Back and CH3Shifts manual update
updated bibliography
CH3Shifts: enabled neighbor list
updated changes
COMMITTOR in the manual
Added missing conversion from PLMD::Matrix

When adding objects to Communicator class so that they can be used in MPI
operations one should add the conversion operator to both Data and
ConstData. Otherwise it is not possible to e.g. Isend() an object
Added possibility to use NLIST with replex

I solved it in the simple way. Instead of asking gromacs
if the exchange has been done or not, I just recompute the neighbor
list explicitly at the step after exchange. This is obtained
by pretending we are on first step in the step after exchange.

Addresses #31 for the case of COORDINATION
Added regtest for NLIST and replica exchange

This test would fail without the previous commit
Updated CHANGELOG
Smooth switching function with D_MAX

Adding STRETCH flag to switching functions they go smoothly to zero
at D_MAX

Closes #52.
Added regtest for switching function STRETCH
Updated changelog
Addresses #53

Now crashed when wrong keywords are used in COORDINATION SWITCH=...
CH3Shifts: small changes
Merge branch 'v2.0'
Small fix in plumed mklib

Target shared library is deleted before attempting its creation.
In this manner, if an error arises during compilation, the
library will not be there.

It is important to have LOAD FILE=xxx.cpp working properly.
E.g. if there is an error during compilation, a possibly existing
library is deleted.
Improved changelog
Merge branch 'v2.0'

Conflicts:
	CHANGES/v2.0.txt
	user-doc/Doxyfile