ERT-514 Export of plot to png and PDF
Merge remote-tracking branch 'upstream/master' into ERT-514

Conflicts:
	devel/python/python/ert_gui/tools/plot/plot_panel.py
	devel/python/python/ert_gui/tools/plot/plot_window.py
	devel/share/gui/plots/rft.html
	devel/share/gui/plots/rft_overview.html
	devel/share/gui/plots/simple_overview_plot.html
	devel/share/gui/plots/simple_plot.html
ERT-514 Export of plot to png and PDF, added support for rtf, rtf_overview
ERT-514 Export of plot to png and PDF, changed the save file dialog in order to work on Linux
ERT-514 Export of plot to png and PDF, changed plot_window and moved trackers to plot_metric_widget. Rename of methods
ERT-514 Export of plot to png. Moved code in order to control when a pages is rendered
Merge remote-tracking branch 'upstream/master' into ERT-514

Conflicts:
	devel/python/python/ert_gui/tools/plot/customize_plot_widget.py
	devel/python/python/ert_gui/tools/plot/plot_window.py
	devel/share/gui/plots/scripts/base_plot.js
ERT-514 Export of plot to png, added method to render plot
ERT-514 Export of plot to png, clean up of code
Merge remote-tracking branch 'upstream/master' into ERT-514
ERT-514 Export of plot to png, moved file dialog in front of rendering so if the cancel button is pushed no image is rendered.
ERT-514 Export of plot to png, set rendering to be progressive
Added stippled line effect to observation line.
Added forced reload of help files.
Refactoring of EnkfFsManager.
ERT-514 Export of plot to png, refactoring plot_metric_widget and plot_window
Merge remote-tracking branch 'upstream/master' into ERT-514
ERT-514 Export of plot to png, added plot_scale_widget.py to cmakelist
ERT-514 Export of plot to png, added margin to bottom of histogram plot
ERT-514 Export of plot to png, added margin to bottom of histogram plot