Add the capability to create tagged pointer and classes in bitmanip
Merge pull request #2739 from deadalnix/taggedref

Add the capability to create tagged pointer and classes in bitmanip
Fix deprecation warning in std.concurrency.

Replace false with Fiber.Rethrow.no to remove the warning.
use a Flag!"throwOnError" for Curl.perform
allow to specify throwOnError for high-level wrappers

- in HTTP, FTP, SMTP perform
Merge pull request #2760 from redstar/concurrency

Fix deprecation warning in std.concurrency.
add JSONValue.isNull

- short-access similar to array, str, object...
- val.type == JSON_TYPE.NULL is fairly verbose
Merge pull request #2750 from MartinNowak/curl2

ThrowOnError flag for curl
Merge pull request #2762 from MartinNowak/json

add JSONValue.isNull
Enter SCons! For now have x86_64 VC++ and x86 DMC++ working

Only building Phobos itself for now.
Minor tweaks to let it build on Linux