Move to cms-externals/thepeg@41e9a26f5ca9659e30e9c27e4dc86e65ecd4a4bd

- New version
- Use tag in place of thepegCommit so that we can actually test PRs
  to thepeg.spec automatically.
Merge pull request #1243 from ktf/new-thepeg

Move to cms-externals/thepeg@41e9a26f5ca9659e30e9c27e4dc86e65ecd4a4bd