Move xbm icon to standard include path
Idlmalloc and jemalloc basic configuration

Both allocator have now minimal settings for working into
htq2. Besides that, there is a new ongoing memory module which
by now is adding a new command for mem stats: mallinfo.
Merge branch 'master' of https://github.com/alericoveri/hecatomb
Merge branch 'dlmalloc'