Tentative Abandonment of RHS Levels 5 and 6

[el cid again]

Unless something requireing a map change occurs,

5.78 and 6.78 editions of RHS will be the last for these levels. Almost all the eratta are small and the few things left in the development bin are labor intensive (seasonal maps for example, or a whole new Allied air OB for EOS/AIO, when art permits it). These things won't be done for Levels 5 and 6 in any event. This means we can drop support for 14 of the 21 RHS scenarios - and be more time efficient.

We will attempt to keep 7.78 at this level for some time - but any corrections that occur will be to this set - unless something we think really needs to be in the other levels pops up.