Bump REQUIRE to v0.7-beta2 (#230)
* Bump REQUIRE to v0.7-beta2
* Fix deprecations
* Fix deprecations
* Remove Compat imports
* Change WignerSymbols version
* First successful build
* Fock tests pass
* Some more tests pass
* All tests except printing pass
* Replace Complex128 with ComplexF64 in tests
* Rename Complex128 to ComplexF64
* Add FFTW requirement
* Update printing
* Add Arpack requirement
* Add rounding to printing
* Update tests to use 0.7
* Fix compilation deprecation warnings
* Fix printing
* Fix deprecations
* Rename full to dense
* Fix some more deprecations
* More deprecations
* Fix operator deprecations
* Fix particle deprecations
* Fix all deprecations occurring in tests
* Update REQUIRE
* Update appveyor
* Fix a bug in subspace; export norm
* Fix silly bug in subspace
