Fixes tn3270 screen rendering issues and bug with storing StartField #1218
A fix was put in to fix screen rendering which broke this library and the other scripts.
This update fixes the screen rendering by changing the way to 'screen' is converted to printable as well as fixing a bug with the placement of the StartField character (was happening after the buffer location counter was incremented, now happens before, which is supposed to happen).
…attributes in the tn3270 buffer (they were one column off). This also fixes the bug that was introduced by the previous screen rendering fix.