Update of the DBM docstring.
"iterations" was badly written.
link to meta doc
Merge pull request #688 from laurent-dinh/dbm_modif

Change in the DBM docstring
Clarify setup.py error message
Backticks
Merge pull request #690 from memimo/doc

link to meta doc
Merge pull request #694 from vdumoulin/setup

Clarify setup.py error message
reduced variance negative phase
fix format of reduced variance PCD, add import it required