Comment 2 for bug 925085

In the date filter bar you can select the year you want to see notes from.
Looking at the code I saw right now 2011 and 2012 are hardcoded, but Footnote should search the first note created and the last one and use those years. So 2011 shouldn't be showed if I haven't any note from 2011 (and maybe even remove the year selector if there is only one year) and we don't need to add 2013 in a year.