[Dev] External split into individual components

[Heikki Toivonen]

Until today the external build pulled one source tarball, which it build 
into one release and one debug binary tarballs. Because of that, 
updating a single library in external meant a lot of work.

I've now split external so that each library will pull its own source 
tarball, and will build its own release and debug tarballs. This means 
that updating any library can be done with a minimal amount of work, and 
several people can work on updating different parts of external at the 
same time.

chandler/Makefile has also been updated, so it will now download 16 
binary tarballs where it used to download only one for external.

This fix did not bring in any new code features, but you may notice that 
our binary tarballs as well as distributions went down a little bit in 
size. This was due to us noticing that there were some parts of external 
libraries that we do not need. There may be more small wins like this 
still remaining, so please let me know if you see more opportunities for 
smaller binaries.

-- 
   Heikki Toivonen


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