r54 insshort()

I've added a sub for shortening assembly code. It contains less information than the long-hand variety, but it's handy for blog postings and diagrams. insflow() and fnflow() now use this by default.

m4s> select insshort(asm) from code limit 20;
4000: mov #23168, &0x0120 
4004: 
4006: mov #19036, r15 
400a: mov #4352, r14 
400e: mov #4354, r13 
4012: cmp r14, r13 
4014: jz $+12 
4016: mov.b @r15+, 0(r14) 
401a: inc r14 
401c: cmp r13, r14 
401e: jnc $-8 
4020: mov #4354, r15 
4024: mov #4407, r13 
4028: cmp r15, r13 
402a: jz $+12 
402c: mov.b #0, 0(r15) 
4030: inc r15 
4032: cmp r13, r15 
4034: jnc $-8 
4036: br #0x43dc 

Cheers,
--Travis