expanding pp.uniq features about pyp HOT 2 OPEN

interesting idea...if you have the time, I can help you rewrite the uniq 
function to cover this.

I've finally got a few cycles, so I was taking a look at the underpinnings.  
But after thinking about this, I realized that there is a workaround...

If in the case above you re.replace w[-1] you can remove it then pipe it to 
pp.uniq() which will then provide the uniq set.  If you need to merge entries, 
you can again pipe it to pp.oneline().  I think.

Its been so long now I forgot the original data set I used that warranted this 
feature.  If I come across it again I'll be sure to add it myself!

I also realized that to implement w[-1] into the pp class would be problematic 
no? Since that refers to a method elsewhere and power pyper does not recognize 
it.