- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* added py-tomopy package
* fixed dependencies and added import_modules
* edited deps for tomopy with import_modules and added py-olefile pkg
* changed module name
* changed dependency to python because it will not build with setuptools
* fixed dependency list for py-tomopy and py-dxchange
* added py-nose dependency
* fixed tests
* commented out dependency py-counter
* fixed dependency py-pybtex-docutils
* removed nose as a dependency
* fixed flake8 errors
* fixed import_modules
* fixed import_modules indent
* fixed various issues in tomopy and deps files
