Verif

Minor bug fixes and improvements:
- honor -ms and -xlim options in some of the diagrams.
- bug fix in -m discrimination
- added --config flag

- New metrics:
- Added -m alphaindex
- Added -m performance
- Added -m discrimination
- Added -m dscore
- Added -m leps
- Added -m nsec
- New features:
- Added -cmap to specify colormap
- Added -elevrange
- Added -lc to specify line colours
- Added -legloc to specify legend location
- Added -logx and -logy to logx logarithmic axes
- Added -sat to show satellite image on maps
- Added -simple to ask for a simpler diagram, when possible
- Better handling of legend entries

- New features:
- Added -x month and -x year
- Added -m meteo
- Added -m roc
- Added -m economicvalue
- Added -m quantilescore
- Better date support:
- Dates can be parsed in -xlim
- Nicer date labels on the x-axis
- Prefer 3h, 6h, 12h, 24h gridline increments

Prototype release suitable for testing