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Commands to manage write delay #6

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Hi,
I failed to write my AT89C64 using the initial "k_uTime_WritePulse_uS". The datasheet says:

The AT28C64E offers a byte write time of 200 μs maximum. This feature allows the entire device to be rewritten in 1.6 seconds.

I wrote a loop to increase the delay and find a working value, which were 150us for my chips. I tried other brands also and they each needed some different value.

So I added two commands, one to set and query the write delay, and another to try to find the suitable value.

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