The configure argument --enable-p_group_cohomology does not work

[culler]

Steps To Reproduce

1. Use the argument --enable-p_group_cohomology when configuring sage
2. Build sage with make build.

Expected Behavior

All configure arguments should work as advertised. In this case the optional spkg p_group_cohomology should be built and installed in sage.

Actual Behavior

The build of the p_group_cohomology fails with an error message saying that the module sage does not exist.

Additional Information

The setup.py for the p_group_cohomology package attempts to import from sage.all, so sagelib should be a dependency of the spkg.

Environment

- **OS: any**:
- **Sage Version: 10.4rc0**:

Checklist

• I have searched the existing issues for a bug report that matches the one I want to file, without success.
• I have read the documentation and troubleshoot guide