dg: add removeBlock() method
dg: add removeBlock() method

we need to have a way how to remove some block we added

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg