Added quarterly and yearly mailreport frequencies

- Defined frequencies for quarterly and yearly mail reports
- Extended frequency-to-crontab conversion logic to cover new frequency settings
- Added form elements for new frequency configurations
- Bumped version number, and added files to deinstall command for cleaner removal

Signed-off-by: Daniel Hunsaker <danhunsaker@gmail.com>
Merge pull request #569 from danhunsaker/enhance/mailreport/more-freqs

Added quarterly and yearly mailreport frequencies