Sorting the address book

[laugengebaeck]

As a user I want to sort my address book entries to have a better overview over my contacts​

acceptance criteria:​

• The address book dialog window has a Sort Panel ​
• Sort Panel consists of sort-by-name, sort-by-mail button​
• Sort-by-name button action: sorts the address book entries by name​
• sort-by-mail button action: sorts the address bool entries by mail​

time needed: M