Minor changes to lang5. Actually finishing the renaming by removing the dayN style files from the repo
Revert "Tests use langN instead of dayN"

This reverts commit 740cfa1c4b820112b3d47c4b7586030c948e346c.
Revert "Minor changes to lang5. Actually finishing the renaming by removing the dayN style files from the repo"

This reverts commit 902f109ddef6f3d4739526ad7bcf6d8cf3dfb8b2.
Revert "removed unnecessary jumps (resembles continuations better too); stack cleanup is static per function and not always taking up max num variables space"

This reverts commit fd3cd4c8d97f7cdb1e173f36f1d72740940e1607.
Some cleanup of lang5