Determine level one terms

[dustine32]

This one's for @thomaspd. The spec shows the two levels of module organization in the diagram:

1. Level 1 corresponds to the top level that determines the color shade.
2. Level 2 is the GO slim term sub-area within a level 1 area containing module boxes for module terms that are descendants of the level 2 term.

Given the data we currently have (goslim_generic_pt.obo and the BP modules JSON), I can organize the BP modules within the level 2 sub-areas. But I'm a little fuzzy on the exact level 1 terms when looking at the diagram:

@thomaspd Could you define the exact GO terms for level 1? I'm currently guessing:

• "cellular processes" -> GO:0009987 (cellular process)
• "cellular metabolism" -> GO:0044237 (cellular metabolic process)
• "multicellular processes" -> GO:0032501 (multicellular organismal process)
• "cell structure" -> ???
• "other processes" -> This is probably just the bucket for any level 2 terms not falling under the other level 1 terms?

Whatever level 1 terms we decide on, I'll version control the list in the repo here.