[Tile-serving] [openstreetmap/mod_tile] memory consumption (#181)

[Hummeltech]

@rolandbosa, great work! Thank you very much for working on this!
> I just thought I'd mention my findings on this issue:
> 
>     * I ran a leak detection and found a tiny, insignificant leak during the configuration parsing. It's 32 bytes and happens once during process startup.
Yes, that was me, I did try and clean everything up and did also check for memory leaks, but I added that modification later and must have missed it. I will take a look at your commit and test it out, feel free to open a pull request so that others may also do so.

>     * I switched out the memory allocator (from glib to jemalloc) and that shows promise...
Good idea, it might be good to also try out https://github.com/google/tcmalloc, which is what openstreetmap.org's tile servers have been using for a while now (since [this commit](https://github.com/openstreetmap/chef/commit/60d30854263245f1c8b42dccd6bfc453811dfde8)).


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