Replace libcurl
In order to be able to deploy the DBO plugin by default on all platforms (this would be useful at SLF), we need to either package libcurl or find a replacement for it. Since libcurl is quite big and we only use the http GET part of it (maybe in the future also the POST), it seems better to look for a replacement. One candidate would be libfetch (https://svnweb.freebsd.org/base/head/lib/libfetch/). It is under a BSD license, it is actively maintained (since it belongs in the core of FreeBSD) and quite small (5 files + 5 headers).