error message reporting in database

[smalleyr]

When looking at error statistics it would be handy if the errors had a number. Each error is "unique" in the sense that the file name, and other details are unique, so it is hard to find out the kinds of errors and how many of each kind there are. If the errors had numbers and there was an error number table one could quickly find specific types of errors.

[demiangomez]

Looking into this to see if it is possible to apply in the next round of updates.