now set to 1.
Close #86

now set to 1.
Close #86

I set it to 2 instead of 2.0, so that it will not be necessary
to update it

If you want to but a plumed_assert in a loop you should now use
plumed_dbg_assert / plumed_dbg_massert.  This will not be included
in the code if you compile with -DNDEBUG

All the source code have been moved into subdirectories of src/
Some of these subdirectories are treated in a special manner:
src/wrapper contains the wrappers for MD codes
src/main contains the main.cpp file
src/config contains files generated without compilation,
  just based on configuration info
src/lib is the place where executables and libraries are put
  at the end
src/cltools contains the command line tools
src/tools contains plumed tools (reusable classes)
src/basic contains PlumedMain, Action hierarchy and other basic stuff
src/multicolvar contains MultiColvar stuff
src/imd is the interactive MD (still not totally portable).

Notice that, to allow easy inclusion of .h files from other modules,
I link all the directories in src/ into module directory. In this
way it is possible e.g. to write #include "config/PlumedConfig.h"

See src/README and src/basic/Makefile to understand how inter-module
dependencies are set

CENTER creates an atom as a weighted average of other atoms.

as suggested by Gareth

I added a PEOPLE file containing list of authors and a script
(src/header.sh) which applies the Licence to all the source files.

It can be applies multiple times (it automatically deletes the present header
and replace it with the new one). Thus, to change the header, edit header.sh
and execute it.

to reflect the fact that these routines return one mass and one
charge.

the fact that one position is returned by this routine

getNumberOfParameters, getNumberOfValues etc

some of the English and in some cases writing new documentation.  Also sorted
a number of issues that arise because of the awkward formatting that is
Doxygen requires

Added keyword registering functions to Action, ActionWithValue, ActionWithArguments and ActionSetup.
Also added variables so that the keyword list can be passed to the Actions

(merged from gat2-reorder branch)

Added keyword registering to all the action classes listed below

(merged from gat2-reorder branch)

Added register keywords functions to all the classes below
(merged from gat2-reorder branch)

Fixed the registerKeywords routines in the committed subroutines

Made sure colvar is adding keywords for numerical derivatives

Oops... genericDebug should register keywords for action pilot.  It does now

Added keyword registering for moving restraint

Added keyword registering for NATURAL keyword

COMPONENTS should have been registered as a flag and not an optional oops

There is a generic ActionWithVirtualAtom class which can be used
as the base for Actions able to add new virtual atoms to the
system. Virtual atoms are stored in Atoms, can be referred to using
the label of the generating action. Automatically, they are
assigned an AtomNumber which exceed the real atom numbers
(e.g. if you have 108 real atoms, virtual atoms will have
indexes 108,109,...). They are automatically understood by
the parser provided one uses the parseAtomList() function.
Each instance of this class only generate a single virtual atom.
The nice thing is that, since lists of atoms can be dynamically changed
(e.g. by neighbor lists), dependencies are handled properly
and a virtual atom is only computed of the steps on which it is needed.

I also implemented a practical case, which is center-of-mass
(GenericCOM).