Solves a bug with METAD + TARGET + GRID_SPARSE
See also #467

This commit contains changes automatically generated by plumedbot on Travis-ci.

* Added on-the-fly tracking of a METAD action's maximum bias.

* Added nearest grid neighbor functions to tools/Grid

* Added path barrier finding routine for gridded functions in tools/Grid.

* Added on the fly tracking of transition bias quantities in METAD.

* Added 1D and 2D METAD transition bias calculation regtests.

* Added transition tempering to METAD.

* Added regtest for transition tempering including TTBIASFACTOR, TTBIASTHRESHOLD, and TTALPHA.

* Added regtest for transition tempering including TTBIASFACTOR, TTBIASTHRESHOLD, and TTALPHA.

* Update MetaD.cpp

removed trailing character, line 398

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

Year in header is here updated to 2017

This is a huge commit, applying indentation to the whole
code. Notice that this commit is made on master branch
after having merged with -s ours from branch v2.3

See #215

This is a huge commit, applying indentation to the whole
code.

See #215

Given header file.h, it is good practice to have a file file.cpp
that includes it as first header.

I just fix the order of includes here. There are still several
headers which do not have a corresponding cpp file, and also
a few that are not included anywhere (which is obviosuly an error).

I will fix them in a later commit.

[makedoc]

I cleaned up some of the (innocuous) warnings

The original implementation I did of this was numerically unstable because
a minimisation rather than a root finding algorithm was being used.  In this
new implementation I have also changed it so that you can specify an upper
and lower bound in your search for a surface

Also made it so that you can change the origin in
DumpMultiColvar and also fixed a bug in MultiColvarDensity

Related to: e1b845b4

Now the type is defined with a typedef so that it is easier to change it.

I also set the type to size_t instead of unsigned long long.
This should be more portable.

This only works for three dimensional grids

(cherry picked from commit ab739533)