Rename member variable "n" to "len"

Describes the _length_ of the array, not the number of elements.
Rename member variable "next" to "num"

Describes the number of elements of the object.
Fix variable name for command number in processor code
Fix variable names in tests
Merge pull request #329 from matthiasbeyer/fix-variable_names_transaction

Fix variable names in transaction type
Add files for binary commands
Add implementation of ws_builtin_cmd_bnot()
Add implementation for ws_builtin_cmd_band()
Add implementation for ws_builtin_cmd_bnand()
Add implementation for ws_builtin_cmd_bor()
Add implementation for ws_builtin_cmd_bnor()
Add implementation for ws_builtin_cmd_xor()
Rewrite band()
Rewrite bor()
Rewrite bxor()