This reverts merge request !19

[backend] Updated flu epidemic method to check if epidemic is occuring during the two weeks preceding the specified date

Updated isFluEpidemic method to check if epidemic is occurring in region for the two weeks preceding the provided date.

returning PatientBean.java to original form with no code smells and pushing code refactoring to a seperate branch

Three code smells identified and fixed. 1- multiple occurrences of the same string literal "MM/dd/yyyy". 2- ageInMs calculation longer than 100 lines. 3- age conversion uses multiple magic numbers.

Added new FormValidationException to throw "no results returned" when database query results are empty.

Added new FormValidationException to throw "no results returned" when database query results are empty.

Added new CauseOfDeathTrendsReportBean class to persist report results data in bean