Added two boolean attributes to class binary. signed and littleEndian.

Modified function binary and as.binary,to deal with those two attributes.

print.binary is calling print.default. removeing attributes first.

Added == operator for binary number comparison.
modified switchEndianess to deal with new binary class(including attributes, signed and littleEndian)
Added two attributes to class binary.
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Adapted function fillBits to deal with new binary class (including attributes signed and littleEndian).