Ignore tags file.
Merge commit '1b6893e2d26d277d832f3519cb6b93c07d85f5d2'
Plugin command to duplicate a value on a dataport

Primarily useful as a sort of revert (read previous value and write it)
but can be used to duplicate any value in the history. (although
performance starts to degrage with really large depths)
Fixes #25 record can handle timestamps in all the same formats that the --start and --end options can accept.
Fixes #23 Encode raw output as UTF-8.
Merge pull request #24 from tadpol/master

Plugin command to duplicate a value on a dataport