File arg on drush_print_table should not have been removed on the 4.x branch.

Commit 3d97c7f broke the output of pm-updatecode, which was using the file argument that said patch removed. I fixed this in master with commit a088dee.

This patch was backported to the 4.x branch with commit 73d6daa. This should not have been done, because it changed the file signature of drush_print_table, which might break external drush commands.

There are a couple of potential solutions to this situation. The change is an improvement, and helpful to the unit tests, so we probably don't want to just back it out. One compatible change that could be made would be to check to see if the 'handle' parameter is a string, and if it is, then assume it is a file path and open up a new handle in 'append' mode. It would also be necessary to insure that the file handle was fclose'd at the end iff it was open. This would maintain compatibility and also preserve the feature.

The code on master is an improvement over what was there before, so I think the above suggestion, if done at all, would only be needed on the 4.x branch. I suppose there would be no harm in doing it in master too, but I don't think it necessary.