Implemented safety(sanity) checks in restoreNAND():

    *Check for match of file and NAND sizes
    *Check for precence of MBR in file(this means that file is not encrypted)
Added user-friendly message for successful finish of restoration.
Edited messages a bit in restore function.
Fixed building on last devkitARM(nand_WriteSectors const buffer in declaration).
Changed version to 1.6.1 to differ from base.