Issues with copy

[bitboy85]

I noticed 3 issues when trying to copy/pasting something from the table:

1. Rightclick -> Copy does nothing (CTRL + C works)
2. The table header is missing when pasting / is not selectable
3. When pasting, its not formated as a table, just tab seperated. For example if you copy from Excel or Libre Office to Outlook, you have a table in you e-mail.

[jpdehollain]

Adding to this list:
4. When I copy a cell and paste into multiple cells simultaneously (by selecting all the cells before pasting), the selected cells get pasted as expected, but when I save the file, the content in the selected cells reverts back to the original