date filter pattern add year to date / month to date / week to date

[PaulPoulain]

Currently, for a date filter, you can chose pattern, that let you chose duration like "this year" or "this month".
We need to be able to chose fixed number of occurrences, like:

• last X months
• last X days
  2 possibilities:
• gold feature = the librarian enter X
• silver feature = fixed choice 12 months, 6 months, 3 months, 1 month, 14 days and 7 days