[PyQt] File Dialogs Not Native In Linux Mint 17.3

[Nick]

Been trying out a ZetCode sample on file dialogs (QFileDialog) using PyQt
5.7 via pip and a custom build of Python 3.5 in a virtual environment. When
running the sample the file dialog looks way out of place (*UGLY* in a
hugely distracting way). Seems to look and behave like the Qt
implementation, not like the native one. The sample runs on Linux Mint 17.3
using Cinnamon (Gtk 3 based) as the desktop.

Cannonical's version of PyQt (5.2.1) with Ubuntu 14.04 LTS, and Linux Mint
17.3 from what I could gather doesn't have the same issue with QFileDialog
looking and behaving out of place. When comparing the sample to the
VirtualBox's Import Appliance dialog (QT 5 based) there are very drastic
differences in the dialog look and behaviour. Geany's file dialog (Gtk 2
based) looks very similar to the VirtualBox one with some minor differences.

QFileDialog with PyQt 5.7 should be using the Nemo (official Linux Mint
File Manager) file dialogs when a PyQt program is running under Linux Mint.
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