[v3] testsuite additions, changes

[Benjamin Kosnik]

>This adds a performance test case for pending work by Jerry Quinn to
>improve floating point output speed. 

This tweaks these tests. I'm now getting useful data when comparing, as so:

CVS
ofstream_insert_float.cc 	precision 6              	3216r 2866u   60s        0mem   23pf 
ofstream_insert_float.cc 	precision 6              	3301r 2860u   64s        0mem   23pf 
ofstream_insert_float.cc 	precision 12             	3448r 2844u   57s        0mem    0pf 
ofstream_insert_float.cc 	precision 12             	3452r 2848u   41s        0mem    0pf 

CVS + JQ
ofstream_insert_float.cc 	precision 6              	2129r 1359u   51s        0mem   10pf 
ofstream_insert_float.cc 	precision 6              	1993r 1379u   56s        0mem   10pf 
ofstream_insert_float.cc 	precision 12             	2012r 1539u   50s        0mem    0pf 
ofstream_insert_float.cc 	precision 12             	2326r 1586u   48s        0mem    0pf 
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