#1202 Add fields for magazine issue numbers to pub records

[Ahasuerus]

Add the following new fields for magazine issue numbers to publication records: Volume, Issue, Whole Issue. On the data entry side, we could have a single line for capturing this information, e.g.:

    Volume: [field] Issue: [field] Whole Issue: [field]

In the New Publication data entry form we would gray out these three fields except for MAGAZINEs and FANZINEs just like we gray out the two Series fields for variant titles. In Add/Clone Pub, we would add pop-up validation.

Further discussion may be needed to flesh out the design.