Draft tutorial documentation
Sectioning of two tutorials
Started adding information for tutorial on dimensionality reduction
Finished creation of dimensionality reduction tutorial
Merge branch 'master' into belfast-tutorials
Added some text to tutorials
Added tutorial on Steinhardt parameters
Merge branch 'belfast-tutorials' of https://github.com/plumed/plumed2 into belfast-tutorials
Added details on trajectory to belfast-10 tutorial
This change makes rt43 runs in a reasonable time
Added links to videos
Fix to adjacency matrix action so angles obey Perron Frobenius
NOE deviations colletive variable.

This CV calculates the deviations of backcalculated
NOE derived distances from a set of reference distances.
NOE: corrected the funcional form
Merge branch 'master' of https://github.com/plumed/plumed2
Added colvars to calculate fraction of atoms with simple cubic arrangment and fcc
NOE: regtests
Using dgesdd rather than dgesvd for pseudoinverse

Fixes #89  Also added rt-make-4 regtests for Matrix class
Merge branch 'master' of github.com:plumed/plumed2
ContactMap: fixed components names