ibdo :: create IBaseRecord

[dev-mlb]

Didn't want this thread to die. From previous conversations, see #896 and #911:

simpler interface (IBaseRecord?) that doesn't have any of the content components - no data(), setData() channelFactory, newInputStream(), header(), footer(), size(), dataLength() ... IBDO would add those on top of the new interface, ExtractedRecord would implement that new interface, and (eventually?), the ExtractedRecords collection would be a collection of IBaseRecord or ExtractedRecord, not a collection of IBDO.

IBaseRecord (many things would just move up to this level withholding some of the data manipulation methods described above)
 -> IBaseDataObject (allows for manipulation of data and extracted records to be added like today)
   -> TopLevelObject (FUTURE: could anchor all trees, replaces need for isTld check in some places)
   -> BaseDataObject (a child object like today)
 -> IExtractedRecord (does not allow for manipulation of data once created)
   -> ExtractedRecord

We probably should come up with a solid definition of what an extracted record is...closest I've got is:

Extracted records are usually treated specially and not run through the processing pipelines proper, but on output do appear as proper child IBaseDataObjects.