Can now compile for Windows, using MinGW.
Have to use gtk+-2.
Change CodeBlocks to use Makefile.
PATH explanation for Windows
Adapt Makefile for either gtk 2 or 3.
Make the status line show something.
Make it possible to use Delete button to remove a pattern.
Use enter to add pattern lines.
Prevent deletion of root node.
Use '+' to add new nodes.
Enter can now be used to edit nodes.
When entering new line, move to it.