first example of Replica Exchange Tutorial
Exercise II REM
PTMetaD Exercise
add package for metadynamics tutorial
configure: inverted the order of the libraries liked with almost
this solution should be more general
NOE: write noe
PT-WTE and PTMetaD-WTE examples
added tarball for REM tutorial
Driver: removed a likely forgotten printf
Added WHAM theory
Improved doc for COORDINATION and DHENERGY
Merge branch 'v2.0'
Improved doc for COORDINATION and DHENERGY
Merge remote-tracking branch 'origin/v2.0' into v2.0
Merge branch 'v2.0'
Allows for KbT to be passed from MD code and used in METAD

I added the possibility to pass kbT from gromacs to plumed.
To allow compatibility between old and new versions, I used the API
number. Namely: gromacs checks that plumed API>1; if so, pass the
temperature.

KbT is only used in METAD so far (not in HISTOGRAM)

Addresses #35
Using temperature passed from MD code in histogram
Added Torsions multicolvar
Merge branch 'fix-35'
Fixed bug in SPRINT collective variables