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  Name:     rol() - bitwise rotate left of a number
  Usage:    rol(<int>,<number>)
  Params:   integer <int> - number to rotate, not greater then 255
            integer <number> number of rotations, less then 256
  Returns:  integer equal to the bitwise rol of <int> and <number>

 ---------------------------------- Example ---------------------------------

                 ? rol(8,1)          && prints 16
                 ? rol(8,2)          && prints 32
                 ? rol(15,3)         && prints 120
                 ? rol(245,8)        && prints 245

  Note:     Rol'ing one value with another will rotate the bits
            in <int> to the left the number of times specified
            by <number>. If bit 7 is 1, that bit rotates around
            to bit position 1. this is useful when reversing the
            attributes on the screen. Rotating <int> by 8 rotates
            all bits back to where they started. rol() only works
            on integer values less than 256. eg:

                 parameter = binary       = dec
                 v1        = 00000110     = 6
                 v2        = 00000010     = 2
                 rol(v1,v2)= 00011000     = 24

            You can use num2bin() and bin2num() to convert
            binary strings into their decimal equivalents for ease
            when using the binary functions.