using a define flag to switch
Added an initial cmake harness to detect environment for building unittest.
Merge branch 'master' of github.com:BTAS/BTAS
1) Updated Tensor::operator=(const OtherTensor& x) where x.storage() == storage_ to do slow but safe copy; the default is fast. Resolves #67
2) Removed Tensor::operator=(OtherTensor&& x) for now since it was identical to copy.
Unit test now correctly links and runs.
unittest/Makefile is gone.
1) unit tests are enabled by default
2) C++11 flags are tested and added, if needed
Merge remote-tracking branch 'upstream/master' into itensor
Added simpletest.cc to unittest_itensor for doing quick tests and backtracing