Fix process bugs
Fix process bugs

* Mark layer as valid when all images are valid
* Delete copy_job if successful

raster-foundry/raster-foundry,kdeloach/raster-foundry,kdeloach/raster-foundry,aaronxsu/raster-foundry,azavea/raster-foundry,kdeloach/raster-foundry,aaronxsu/raster-foundry,azavea/raster-foundry,kdeloach/raster-foundry,raster-foundry/raster-foundry,raster-foundry/raster-foundry,aaronxsu/raster-foundry,azavea/raster-foundry,kdeloach/raster-foundry,azavea/raster-foundry,azavea/raster-foundry,aaronxsu/raster-foundry