Method revised for adding new material to a job.
Table viewport size set in ExternalAdd screen.
Background image inserted on MainScreen - Eamon
Images and Mnemonics added for multiple action listeners
Toolbar added to MainScreen.
MainScreen set to maximised on launching and values added for minimising
screen.
Merge pull request #4 from liamwaugh/branch_LW_20140316

Method revised for adding new material to a job.