Yesterday we found that the dots in line patterns are not shown because their size is too small.
I've made changes to DxfLinePattern to generate the internal pattern with dot size equals to line width, a new pattern for each line width is created and cached.
Only the dot size changes, so small lines might be smaller than dots in some cases.

The layer widget now have a button to edit a layer. Before only name could be changed by double-clicking on it.
The differences with LC2 are the ability to modify layer name, and the layer doesn't need to be selected before editing it.