wProcessorRevision is built from model and stepping.

Add a simple test for bitmap bits/metrics, fix GetBitmapBits for an
empty (not selected into a DC) bitmap.

Optimise WHERE operations on matching against strings by adding a new
function find_matching_rows to the views, which eliminates the need to
examine every record when executing a query. Implement this function
in the table using a hash table on the ID stored in the data.

Copy from the start of the cookie name, not the cookie data when
parsing cookies with a NULL cookie name.

(after the thread pool has been improved).

- wrong cut & paste across versions of a given record type
- wrong definition for register_v2