Merge pull request #120 from blazf/TStr

Added Linux C++ tests
NULL replaced with nullptr
get space string
Merge pull request #121 from rupnikj/TStr

T str
unit test
Merge pull request #122 from rupnikj/TStr

unit test
Added std::move and std:swap to TVec::Resize and few other places.
Fixed old bug called GetSpaceStr with bad parameters. Added Hash table tests from SNAP.