Enrichment explanations and wording could be improved

[yochannah]

From feedback via Gos:

Mouse-over p-value explanation good but text needs to be more informative i.e. needs more
explanation of what has actually been done. Or maybe the "Enrichment" header needs a "?".
Filter enrichment box: works, really nice! Works on internal substrings - like!

Nice that contrasting grey for miRNNA enrichment when (0)
Maybe, shock, we shouldn't call enrichment "enrichment" but "unexpectedly common" or
something like that. Or use that for the top title or top title explanation and then use
enrichment below as more concise.

[yochannah]

we addressed this at some point and forgot to close it - see the nice [how is this calculated?] link, top right: