fix test suite, reorganize folder structure

.gitignore

Makefile

archive/template.m

src/fetch_series.m

src/fetch_series_by_api_link.m

src/initialize_mdbnomics.m

src/utils/fetch_series_page.m

src/utils/filter_series.m

src/utils/flatten_dbnomics_series.m

src/utils/flatten_editor_series.m

src/utils/iter_filtered_series.m

src/utils/iter_series_info.m

src/utils/normalize_period.m

src/utils/normalize_value.m

tests/runalltests.m