WIP: Update photutils-benchmarks after asv and photutils changes

I'm trying to get the `photutils-benchmarks` to run again.

At the moment I'm seeing a lot of failed benchmarks, but no error messages even with `--show-stderr`:
```
$ asv run --quick --show-stderr --python=same --bench time_mult_bg_ap_err_exact
· Creating environments
· Installing dependencies
· Discovering benchmarks
· Running 4 total benchmarks (1 commits * 1 environments * 4 benchmarks)
[  0.00%] · For photutils commit hash 5a7519c0:
[  0.00%] ·· Building for /opt/local/bin/python
[  0.00%] ·· Benchmarking /opt/local/bin/python
[ 25.00%] ··· Running aperture.CircularAnnulusPhotometry.time_mult_bg_ap_err_exact                                                                  failed
[ 50.00%] ··· Running aperture.CircularAperturePhotometry.time_mult_bg_ap_err_exact                                                                 failed
[ 75.00%] ··· Running aperture.EllipticalAnnulusPhotometry.time_mult_bg_ap_err_exact                                                                failed
[100.00%] ··· Running aperture.EllipticalAperturePhotometry.time_mult_bg_ap_err_exact                                                               failed
```

@mdboom Shouldn't I see an error for each failed benchmark on the console?

PS: `asv dev -h` says this, but the `--show-exc` option doesn't exist any more:
> This runs a benchmark suite in a mode that is useful during development. It is
equivalent to ``asv run --quick --show-exc --python=same``