Creating a new poll based on the settings of an existing poll

[Jefferson49]

In #86, the proposal was raised to copy an existing poll to a new poll, escpecially the poll settings.

Some ideas about this:

• A poll could be selected in the poll view
• If a poll is selected a Copy button could be shown (or activated)

[Jefferson49]

Added save as copy to poll view with dfd5137

[Jefferson49]

Tried to add "Copy" to polls view. Not working yet