Metadata correction proposals

* *The First Advance* - according to the info panel this book belongs to the 'new' /SPCK International Study Guide/ series that was just added

* *Grace Abounding to the Chief of Sinners* - incorrect publication date (both editions)

* *Hard Question about Christianity Made Easy* - should be "Hard Questions ... " (plural)

* *Introduction to the History of Christianity, with CD-ROM* and *Study Guide for Introduction to the History of Christianity, with CD-ROM* - remove "with CD-ROM" from titles as these are download-only products now

* *Lake’s Apostolic Fathers* - missing series tag