Document f3 checkpoint layout

Move f3 checkpoints into f3 directories

Move NHEK RNA f3 checkpoints

Move HUVEC RNA f3 checkpoints

Move HepG2 RNA f3 checkpoints

Move H1 RNA f3 checkpoints

Move GM12878 CAGE f3 checkpoints

Move GM12878 RNA f3 checkpoints

Move K562 CAGE f3 checkpoints

Move K562 RNA f3 checkpoints

Document all cell-line checkpoints

Add H1 RNA f1 f2 f3 checkpoints

Add NHEK RNA f1 f2 f3 checkpoints

Add HUVEC RNA f1 f2 f3 checkpoints

Add HepG2 RNA f1 f2 f3 checkpoints

Document f1 and f2 checkpoint sets

Add GM12878 CAGE f2 checkpoints

Add GM12878 RNA f2 checkpoints

Add GM12878 CAGE f1 checkpoints

Add K562 CAGE f2 checkpoints

Add GM12878 RNA f1 checkpoints

Add K562 CAGE f1 checkpoints

Add K562 RNA f2 checkpoints

Add K562 RNA f1 checkpoints

Add validated gene-expression checkpoints