Add readavailable for AsyncSockets
Remove wait_readavailable_filter, use wait_readnb
Portuguese documentation should now work without the /en/latest
Merge pull request #2860 from andrioni/patch-2

Portuguese documentation should now work without the /en/latest
Make special matrices part of matrix factorizations in the manual
Add Clang.jl in the calling C++ section
Merge pull request #2831 from danielmendel/add-readavailable-from-stream

Add readavailable for AsyncSockets