  \/ J - J O I N \/

Joins lines as specified, then acts as a 'MODIFY' on the result.

Format
 JOIN <line no.>,<1st no. of lines>,<2nd no. of lines>

Parameters
 <line no.>  # of 1st line to be joined. Must be specified
 <# lines 1> # of lines to be joined onto the first line. Optional - taken as 1
             if not specified.
 <# lines 2> # of lines to be modified (including the joined line).
             Optional - taken as 1 if not specified. ESCape can be used to
             terminate editing before this number of lines has been edited,
             if required.

File position
 The file is left after the last line modified.
