[PATCH v2 7/7] bisect: allows any terms set by user

This message's goal is to explained where am I on the bisect 
functions. 

-git bisect replay now work with any terms. 
-I took account of most of the last reviews (coding style, 
double sed ...)
-'git bisect terms' without arguments now display the current 
terms 
-bisect_terms : if a bisection has already started, a more 
verbose message is displayed 
-I solved a merge conflict in bisect.c due to the update of 
master branch. 

To submit a v3 I would need answer about how we rebase the commit 
history and what do we do to simplify the life of the user with the 
terms (see my last mails). 
I was thinking of: 
-a config variable that would say :"as long as I don't reset keep 
the terms of the previous bisection" 
or we could decided that this is the default behaviour of bisect. 

-two config variables to choose default terms 

I may have less time in the next days but I would like to submit a v3.