Revert "tr: zip had a string as input. call { } zip-as instead."

This reverts commit 3c4d1e41b76eafbfa48e272276e8a1216a694647.
Revert "checksums.interleave: Dumb fix for zip change."

This reverts commit 4b8de3ca1ec6e2e9a564e67a94a4fc4d4f7a371f.
Revert "tools.gc-decode: Dumb fix for zip change."

This reverts commit 4c1f7451a4012e8ad036f160ac614a43c8de8732.
basis/extra: fix using for map-index move back to sequences.
assocs: moving map-index back to sequences, change zip and zip-index to make alists.