BAM: PUTSTRING prototyping

[CharlieJV]

The PUTSTRING feature to "roll/unroll" a single character in one or more directions (currently only towards the right, or the left, individually or simultaneously), graphically positioned on the screen:

• Run the program
  
• View the source code
  

First version of that sample had "roll right", now has "roll right" and "roll left".

Roll one direction, or roll the other direction, or simultaneously roll both directions.