generate-config: display line numbers in errors

[oschaaf]

Display line numbers when an exception occurs during interpretation of a .pyconf file, for easier debugging

[oschaaf]

I tested some more, and noted that I'm not done with this yet, I need to add tracking of which key is defined at which line number to make sure I catch all I can.

[jeffkaufman]

This line doesn't seem to do anything. If I remove it or change it to \n\n I still get the same incorrect line number (in my case 455 when I added an error on line 369) reported. (And the incorrect line numbers I'm seeing are too high, which is weird.)

[oschaaf]

@jeffkaufman
This should display line numbers most of the time. The line numbers should also be correct now. I still need to modify move_configuration_to_locations and merge_location_config as well to accommodate for the moved paths. I think that if an error occurs during processing an inherited header configuration for example, the line number will display as 'unkown' now.I thought I'd make a pull out of what I have now for the sake of progress.

[jeffkaufman]

LGTM