sync: src/ now reflects statlens-0.1.7 wheel

cleanup: drop 0.1.6 src/ before re-syncing 0.1.7

sync src/ to 0.1.6 (full source mirror of statlens-0.1.6 wheel)

cleanup: drop outdated src/ mirror — full source is inside the 0.1.6 wheel

add statlens package source code