DB: ApplicantDatabaseWriter

[ottlinger]

• [x] getByNameAndMailadress($firstname, $lastname, $mail)
• [x] persist($applicantInput)
  • set fullName if combination already exists
  • use Parser to map from bean to database structure / create a safe INSERT INTO ...
• [x] getAllByWeek($week = NULL)
  • use in admin area as a self-submit list of applicants
• [x] generate a combinedName in case an applicant with the same firstname, lastname combination does exist in the database => contains timestamp
• [x] show lists of all applicants as a table in admin area
• [x] show lists of applicants per week in admin area
• [x] provide protection against SQL injection in BaseClass
• [x] add length protection from form input to comply with the database (leave aside possible UTF-8mb4 encoding issues)
• [x] show number of rows for each table in the db in admin area