DC-Pit: DIN 1054 change A1 available

Change for the proof loads for anchor design

The change A1 of DIN 1054:2005 (A1:2009-07) is now supported in the program DC-Pit. For the design of anchors the proof load now has to be used as 1.1 * Ed (design value) instead of 1.25 - 1.50 * Ek (characteristic value).