This should be faster than the other options (reusing an existing handle or using a pointer) because it avoids an extra copy of the data inside Marinetti. For the other options, Marinetti will create a new handle and copy the data to it anyway, but then copy it again into the requested destination.
The logic for making sure the color table was complete before connecting was slightly broken due to wraparound, so it would cause all entries to be generated, re-generating any that already had been. This fixes it, which should make the initial connection process slightly faster on slow systems.
The buffer from the last read is still left around until the next one, but this should usually be fairly small, and it's the same behavior as the main DoReadTCP routine.
