[Feature Request] Add filtering by past 2 to 10 years

[throwaway-3]

Currently the plugin supports time base filtering such as:

• z d: Filter results by past 24 hours (day)
• z w: Filter results by past week
• z m: Filter results by past month
• z y: Filter results by past year

It would be very useful for me to also have filters for 2 to 10 years.
Most useful intervals for me would be 2, 5, and 10 years.

Proposed shortcuts:

• z <X> y: Filter results by past year
  where <X> is a number from 1 to 10 (z 1 y would alias z y for consistency)

[infokiller]

Thanks for the feature request. I personally have little interest in it and won't have time to implement this anytime soon, but I welcome PRs.