Ezigrade 4.0.2.72

Couple of extra's in Ezigrade Tile Drainage - Pipe stuff. (1) We have added in a new constraint. We can now define a minimum pipe offset. Previously this was zero. Specifying a value here means that for example a lateral is allways a minimum value above the submain or main at the lateral outlet. Simply leave off if you want the old method. (2) We have added in a routine to add in a new node along a pipe. Select the pipe first and then from the pipe menu click on the "add node" menu item and click in the position of the new node. For example if you wanted a more curved section then click in a new point before and after an existing node. Then drag the existing node to match the curve.