need a more descriptive name for the parallel work: JMP NEXT vs. RET

diff --git a/fig-forth-auto6809.asm b/fig-forth-6809_jmp.asm
similarity index 100%
rename from fig-forth-auto6809.asm
rename to fig-forth-6809_jmp.asm

diff --git a/fig-forth-auto6809opt.asm b/fig-forth-6809_ret.asm
similarity index 100%
rename from fig-forth-auto6809opt.asm
rename to fig-forth-6809_ret.asm