fix multiplication bug and issue with trunkate zero chunks

see issue #1 and #2

fixing binary OR and XOR operations

0.1.6

changing length to chunksLength in BigInt API

little fix of bitsize-macro IntUtil for haxe 4.2

0.1.3

little fix of bitsize-macro IntUtil for haxe 4.2

fixing multiplication and inc-/decrement, adding pi-benchmark

• fixing regression bug inside multiplication
• fixing bug vor ++ and -- operations where argument or result is zero
• adding benchmark to calculate pi

coded once, runs everywhere ;)

first haxelib release