This cleanup replaces snprintf() usage with specific calls, they have
the benefit of being cleaner (so easier to grep), typing less and also
marginal speed up compared to the other (specially concat_static),
although those are rarely used in critical paths.
I'm testing it for some time and seems to not break anything, but let
me know of any problem. If you can review the patch and try to spot
incorrect names, please do.
SVN revision: 40014