Added an error to avoid an uninitialized value
Fixed ref in changelog
Fixed ref in manual
A few fixed in tutorial.

Notice that latex cannot be used in captions
Added missing tutorial image for path
Fixed documentation for landmarkselection
Added total bias

A component called "bias" is needed for replica exchange to work properly
Changelog
Renamed for consistency
changelog
SimpleMD now passes kbT to plumed
Merge branch 'v2.0' into v2.1
Added BIASVALUE to one test
Merge branch 'v2.1' of github.com:plumed/plumed2 into v2.1
Merge branch 'v2.1'