Ported MongoChem to Qt 5

Change-Id: I318939c9c98b9f99dbdb309b194929252531071b
Use triggered() signal for actions

Fixed some minor style issues, dialog now opens correctly.

Change-Id: I47d04189b9e56d3faf39313afe2ed2ca67413c96
Merge branch 'qt5'

Change-Id: Iff45886047f4811cb0704217fd2726053d3871df