--------------------------
- Made the following command-line scripts work again (and added tests):
- gopca_print_info.py
- gopca_extract_signatures.py
- gopca_extract_signatures_excel.py
- gopca_extract_signature_matrix.py
- gopca_plot_signature_matrix.py
- Updated section on the command-line interace in the documentation, and added
it to the table of contents.
- Internals:
- Changed naming scheme of some source files (main.py => cli/go_pca.py,
go_pca.py => gopca.py)