Added extra options to the DisplayActivity ActionBar menu

Signed-off-by: zubietaroberto <zubieta.roberto.e@gmail.com>
Removed Settings

Signed-off-by: zubietaroberto <zubieta.roberto.e@gmail.com>
Fixed wrong currency display

Signed-off-by: zubietaroberto <zubieta.roberto.e@gmail.com>
Added an AboutDialog

Signed-off-by: zubietaroberto <zubieta.roberto.e@gmail.com>
Implemented account deletion

Signed-off-by: zubietaroberto <zubieta.roberto.e@gmail.com>