Re: [SyncEvolution] SDK documentation for syncevolution

The changes necessary to fix this are a bit intrusive, but not particularly risky: * install libsyncevolution header files in a standard path: /usr/include/syncevolution/*.h * change the #include rules inside these .h files so that they use "syncevolution/" as prefix for all of them, rename "core" directory to "syncevolution" * don't depend on config.h in the header files (apps might not have the same defines in their own config.h) * install libsyncevolution.la and add a .pc file for it * scan a directory for backends to open dynamically in SyncSource.cpp instead of using a hard-coded list (should also work when running inside the build directory, with backends in backends/*/.libs)