Add low-level arithmetic and logical operations to Data/Bits

[Lorenzobattistela]

Implement algebric algorithms directly on bits, such as:

• [x] Dec
• [x] Inc
• [x] Add
• [x] Sub
• [x] Mul
• [x] Div
• [x] And
• [x] Or
• [x] Xor
• [x] Rshift
• [x] LShift

Each one of these should be in a different file (module) under Data.Bits .