Record merged entries and redirect from old to new entry

[GoogleCodeExporter]

Could be done as follows: when the source entry is merged to target, the source 
is deleted and a merge record will be added. When someone attempts to open the 
old entry, a message is displayed with a link (and possibly automatic redirect) 
to the new entry.

Might need to handle cases where the target entry is also merged to some other 
entry.

Original issue reported on code.google.com by rii...@gmail.com on 28 Jul 2013 at 10:00

[GoogleCodeExporter]

For API queries regarding the old entry, the redirect might be performed 
automatically, or a redirect response will be returned.

Original comment by rii...@gmail.com on 28 Jul 2013 at 10:01

[GoogleCodeExporter]

Original comment by rii...@gmail.com on 28 Jul 2013 at 6:07

• Changed state: Started

[GoogleCodeExporter]

Original comment by rii...@gmail.com on 30 Jul 2013 at 3:41

• Changed state: Done