Add --no-reprojection option
Reproject mosaic using montage.reproject()
Add Bash completion for --no-reprojection
Reproject the mosaic so that North is up

This merges branch 'reproject-mosaic-point-north'
Add gtk_sync() context manager
Add disable_while() context manager
Add LEMONdB.vmin property

This property stores the 'vmin' parameter of APLpy's logarithmic
normalization algorithm (stretch = 'log') in the METADATA table. This
value can be reused by the LEMON Juicer GUI in order to normalize the
finding chart — so that the appropriate value of the parameter has to
be identified only the first time we work with the image.
Add LEMONdB.vmax property

This property stores 'vmax', the second parameter of APLpy's
logarithmic normalization algorithm, in the METADATA table.
Add LEMONdBTest.test_vmin_and_vmax()
Fix typographical error
Add PreferencesDialog class
Add PreferencesDialog.__init__()
Add PreferencesDialog.hide()
Add PreferencesDialog.show()
Add PreferencesDialog.destroy()
Add PreferencesDialog.normalize_plot()
Add PreferencesDialog.handle_response()
Update FindingChartDialog.__init__()
Update FindingChartDialog.handle_response()
Replace ValueError with an assertion