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This fixes a problem in the way atoms are setup for calculations where you take an input
from a multicolvar filter as input to a new multicolvar if SPECIESA and SPECIESB are used.
For instance you might be calculating Q6 for those atoms that have a coordination number
greater than 4

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Notice that almost all files were updated with the astyle commit
2813d759

Year in header is here updated to 2017

File was inconsistent with action and class name

Also ran astyle

* Added R_POWER option to multicolvar/CoordinationNumber

This is to allow the coordination number moments from White and Voth
2014 JCTC and subsequent papers. They are used as a scalar proxy for
biasing radial distribution. Regtest and CHANGES line have been added as well
as the function/documentation.

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I used the same convention as in tutorial 1:

- plumedfile for plumed input
- verbatim with ">" for shell commands
- verbatim with "gnuplot>" for gnuplot commands

In addition, I used code{.py} to color python syntax

@gtribello just revert if you think there is some problem

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