[Atlas] Fix UI to be consistent with the use of QgsCollapsibleWidgets
[Atlas] Update spacing for atlas panel
Merge pull request #1 from dakcarto/atlas-ui

[Atlas] Update spacing for atlas panel
[Atlas] Replace QgsCollapsibleGroupBoxBasic by QgsCollapsibleGroupBox (add auto-save collapsilble states)
Revert "[Atlas] Replace QgsCollapsibleGroupBoxBasic by QgsCollapsibleGroupBox (add auto-save collapsilble states)"

This reverts commit 56e9fb3eba0dfaf8f02bb2ccb66eb0218066a8f3.
Merge pull request #435 from Oslandia/atlas

[Atlas] Fix UI to be consistent with the use of QgsCollapsibleWidgets