fix errors when compiling within Yosys: "ISO C++17 does not allow 'register' storage class specifier"

fix errors when compiling within Yosys: "ISO C++17 does not allow 'register' storage class specifier"

add orchestration function (local greedy); usage: orchestrate -h

Fix segv constr

Prevent types from stdint to be defined under abc namespace

Make sure all 32 bits of bit-field are initialized.

Fix undefined behavior in signed/unsigned shifting.

Don't #define _DEFAULT_SOURCE if already defined.

Fully namespace-qualify std::inserter(); add missing include.

Signed-off-by: Henner Zeller <hzeller@google.com>

Transduction option fix and multi-threading