doxygen: save result count instead of node size to search binary.

doxygen: save result count instead of node size to search binary.

Makes the code much simpler and allows for up to 256 children and 256
results in each node, instead of limiting its size to 512 bytes (thus
e.g. 64 children and 127 results or some other combination).

I like it when things get better, more flexible and simpler by removing
a bunch of complicated code.