Sanity check for existing loggers during logger data import

[jkall]

From [email protected] on February 11, 2014 12:52:06

Whenever logger data is to be imported, perform a sanity check (by querying table ”loggers”) to verify that there actually is supposed to be a logger at this position, during this period.

Original issue: http://code.google.com/p/midvatten-plugin-for-qgis/issues/detail?id=45