Change LengthHydro unit

After discussion, it seems that it would be better to change the unit of LengthHydro from [m] to [km].

In this case, it is necessary to modify:

• code of RunModel_Lag()
• man of CreateInputsModel()
• man (example) of RunModel_Lag()
• vignette "sd_model"
• some tests

changed milestone to %v1.6.11

mentioned in commit 734f6945

Maybe the CreateInputsModel() function should return a warning message to inform users of this change. What do you think about it, @david.dorchies?

I don't agree if this is systematic. Maybe only if the distance exceeds 100 km?

OK for me!

Or maybe 1000 is a safer value for avoiding unnecessary warning on very big catchment and if the user use the meters any distance will be more than 1000 m.

changed the description

mentioned in commit 4336bd11

Closed with commit 4336bd11 and merge of !31 (merged)

closed

mentioned in issue in-wop/airGRiwrm#32 (closed)

added SUGGESTION label

mentioned in commit 3033b69e

mentioned in commit 24b50777

mentioned in commit 569ff8c5

mentioned in commit 90a095fc