skipchain follow deduplication

[jeffallen]

This doesn't seem right:

$ ./scmgr admin f -id 01 -any 127.0.0.1:7002
./scmgr admin f -id 01 -any 127.0.0.1:7002
bash-3.2$ ./scmgr admin f -id 01 -any 127.0.0.1:7002
./scmgr admin f -id 01 -any 127.0.0.1:7002
bash-3.2$ ./scmgr admin ls 127.0.0.1:7002
./scmgr admin ls 127.0.0.1:7002
Followed skipchains:
01
01

It is unclear to me if the right answer is refusing the second add, or silently deduplicating it.

[jeffallen]

Remove scmgr for v3.