ALTER of array data muddles field info

[chipbarnaby]

Arrays that allow variable # of input values don't set Example

• Input array data, e.g. PERFORMANCEMAP with N elements
• ALTER that array and provide fewer values

Upshot is that filed status values such as FsSET and FsVAL are not correct for the updated array.

Believed caused by field status not being re-initialized at ALTER time.

A quick search did not locate where initialization is or should be occuring.