Fix and speed up EXT#handle=number doing nothing when number is beyond 2GB
Internally LanManFS was representing file offsets and data lengths as signed numbers, while in general this doesn't matter (they are passed through opaquely as just numbers and not manipulated) in a couple of places they were being used as while () loop exit conditions. Function WriteZeroes (used when extending a file via OS_Args) therefore never performed the call to SMB_Write when beyond 2G because the loop condition was never met. Additionally, it was literally transferring buffers of zeros across the network which is unnecessary as the server is documented as doing a zero fill itself, this represents at least a x40 speed up (on a slow 1MB/s drive write speed at the server end) or more. Changed offset & lengths from int to uint. Added the earlier CIFS spec (the later copy is missing section 5 for some reason) to docs. Version 2.38. Tagged as 'LanManFS-2_38'
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