Lots of new NEC firmwares and an updated Binflash version

I was quite busy during the last few days (and nights) updating Binflash to support for ND4550A drives and modifying some firmwares.

The following firmwares have been added
ND 4550A 1.06, 1.06 with bitsetting patch and 1.27
ND 3520A 3.06 and 3.06 with bitsetting patch
ND 3540A 1.f1

Big thanks go out to TDB for their help with the checksum routine on 4550 drives and to Dee for testing the 4550 support in Binflash and a lot of testing with my modified 4550 firmwares.