1.10.4 : fix #115 : Rules based labeling filter
1.10.3 : fix #82 : Do not filter labels when the mask is invisible
1.10.2 : fix #89 : Help not showing Extensions
1.10.1 : pull request #85 : Add the keep_layer argument to the DO function
1.10.0 : Code reorganization, enhanced documentation, optional mask/atlas
interaction
1.9.4 : fix #78 : Python error atlas + mask, fix #79 locale.Error
1.9.3 : fix #77 : The absence of 'locale' probably behind the bug.
1.9.2 : fix #76 : Updating the existing mask doesn't update extents, and mask
little less blue by default
1.9.1 : fix #75 : Locale symbol for decimal value,
https://github.com/aeag/mask/issues/75
1.9.0 : Minimum fixes allowing a nominal work with the atlas. Fix #68
1.8.4 : fix #72, issues/21214
1.8.3 : a partially functional version (Atlas does not work anymore)
1.8.2 : adaptation to API changes (QgsCoordinateTransform)
1.8.1 : do not affect Rule based labeling
1.8 : Some API changes (QgsExpression, QgsPalLayerSettings)
1.7 : Migration to QGis 3
1.6 : master developpement version (not released)
1.5.1 : enables plugin only for qgis <=2.8 . See
https://github.com/aeag/mask/issues/51
1.5 : fixes number of issues with Atlas, UI improvements.
1.4 : zooms to mask and clears selection on the fly.  Some fixes due to
mask_plugin renamed to mask
1.3 : enhance spatial operator for exact labeling filter. Was "contains", now is
"contains" or "overlaps"
1.2 : bugfixe release :
- Crash after removal of the mask layer
- Unfreeze mapcanvas when atlas previewx is ON
- Disable label filtering if mask layer has no object
1.1 : bugfixe release
1.0 : Can be used with atlas, 2.4 compatible
0.9 : Can be used with atlas, 2.4 compatible - test version
0.5 : QGis 2.0 Compatible
0.4 : Python console callable