Generate repeatable attributes as a list format

Currently there are 4 attributes that can have multiple values:

  WaDefinition

  WaEclname

  WaSection

  WaIdDependency

Currently the service may return multiple values for these attributes.  For Gordon Smith to support them properly they would be much better returned as a list in the format

["<val1>","<val2>...]

The service layer should be modified to convert attributes that can be repeated into that format.

To help that there are two versions of the attributes - WaX and WaXList, the idea is that wudetails will convert multiple instances of WaX into a single instance of WaXList.  There is a new function: getListAttribute which returns the attr for the list form - if the attribute can occur multiple times.

See processing of WaDependency/WaDependencyList in new PR for an example.