Way to Clean up saved history

[mangalakader]

Hi @ferd ,

Currently, the group history doesn't export a clean up function for cleaning the saved history. But since you are using disk_log for later versions of erlang, you can indirectly export the truncate function in the disk_log module for cleaning up the saved history. I could do a PR if that would help speed up the process...

Thank you,

[ferd]

This code is no longer maintained, the official versions lives in the OTP repository. I just forgot to archive the repository.