refactor

[teresi]

• update the system test in Makefile
• remove dead recipes in Makefile
• initial refactor to open existing merge data file, add initial read calls

TESTING

is the help recipe updated?

[18:08 GOKU][f/read_h5]->(d8bc):/data/genes/TE_Density
[ins]▸$ make help
help                           Show this help
system_test                    run system test on sample data
system_clean                   clean the system test
test                           run the tests
flake8                         run style guide
lint                           run linter
tags                           run ctags

does the system test pass?

(genes_310) [17:28 GOKU][f/read_h5]->(d8bc):/data/genes/TE_Density
[cmd]▸$ make system_test
...
subsets: 100%|██████████████████████████████████| 30/30 [03:35<00:00,  7.18s/it]