Comment 2 for bug 586787

I've talked to mvo and we decided that the best way to do this is to detect whether the patch already exists in debian/patches or whether it's a "local" patch on the filesystem that needs to be added. If it's the latter we copy it into debian/patches, add it to series/00list and then run edit-patch on it to make sure it applies and let the user make any edits that are required.

I've tested this patch on a couple of packages for each patchsys and haven't found any problems.