Use single click for selection, double click for displaying document

[jsbien]

In the text panel double click is used to display the hit in the main windows and single click to highlight the hit, while in the graphical panel the single click both moves the focus to the hit and displays in the main panel.

What about using consistently single click to select (cf. issue #13) and move the focus, and double click to display in the main window?

[Michał Rudolf]

Use double click for displaying document. Closes #35.

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