Compiling without optimization

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I have added a new flag for configure, because if you disable optimization the programs are built faster, much faster. 

make all: 
 
-O0 
real	3m48.038s 
user	3m30.337s 
sys	0m15.009s 
 
-O3 
real	10m14.074s 
user	9m49.612s 
sys	0m21.770s 
 
 
make test: 
-O0 
real	15m33.645s 
user	12m23.936s 
sys	2m0.118s 
 
 
-O3 
real	10m14.074s 
user	9m49.612s 
sys	0m21.770s

The extra time the compiler takes for optimization makes a runtime with make all take 10 minutes of real time. If optimization is disabled it takes only 4 minutes.

The option is --build-quickly and it is not the default. The default continues to be optimization. We should avoid disasters by not making new options that people should set for production.

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