Correct conversion to and from inch/mm of Mercury in Marbles WeatherPlugin.
Correct conversion to and from inch/mm of Mercury in Marbles WeatherPlugin.

svn path=/trunk/KDE/kdeedu/marble/; revision=1005797

rku/marble,oberluz/marble,probonopd/marble,AndreiDuma/marble,David-Gil/marble-dev,utkuaydin/marble,AndreiDuma/marble,tzapzoor/marble,oberluz/marble,quannt24/marble,Earthwings/marble,probonopd/marble,adraghici/marble,tzapzoor/marble,adraghici/marble,adraghici/marble,tucnak/marble,adraghici/marble,David-Gil/marble-dev,quannt24/marble,utkuaydin/marble,tucnak/marble,utkuaydin/marble,quannt24/marble,rku/marble,David-Gil/marble-dev,AndreiDuma/marble,Earthwings/marble,quannt24/marble,tucnak/marble,probonopd/marble,tucnak/marble,probonopd/marble,utkuaydin/marble,tzapzoor/marble,tucnak/marble,probonopd/marble,tzapzoor/marble,tzapzoor/marble,AndreiDuma/marble,quannt24/marble,quannt24/marble,adraghici/marble,tzapzoor/marble,adraghici/marble,rku/marble,Earthwings/marble,tucnak/marble,rku/marble,utkuaydin/marble,tzapzoor/marble,David-Gil/marble-dev,oberluz/marble,oberluz/marble,rku/marble,Earthwings/marble,AndreiDuma/marble,oberluz/marble,Earthwings/marble,utkuaydin/marble,Earthwings/marble,David-Gil/marble-dev,quannt24/marble,tucnak/marble,oberluz/marble,tzapzoor/marble,David-Gil/marble-dev,AndreiDuma/marble,probonopd/marble,probonopd/marble,rku/marble