Added new css styling to be use for the new delete controls in the nursery screen

GCP-10465

Reviewer: Daniel Villafuerte
Modified the delete variable function to accept multiple id values.
Added a function in settingsUtil for parsing the | delimited string and converting it to list of integers

GCP-10465

Reviewer: Daniel Villafuerte
Modified function that checks if the variable has measurement data or not.
Added a setter function for the userSelection so we can test it via JUnit

GCP-10465

Reviewer: Daniel Villafuerte
Change the individual delete button to use a checkbox for deleting.
Added js function for allowing to delete multiple variables at the same time

GCP-10465

Reviewer: Daniel Villafuerte
Modified code to use message properties for the labels

GCP-10465

Reviewer: Daniel Villafuerte
Modified code to use string instead of boolean value for comparision

GCP-10465

Reviewer: Daniel Villafuerte
Added new JUnit test cases to cover changes in the functions

GCP-10465

Reviewer: Daniel Villafuerte