Fix loading of WeightedAverage list
Revert "Use standard icon size"

This reverts commit d6653273717f3b70fba40fb140319a31c64472f5.
Use standart (16x16) icon size for dock tabs
Revert "Fix bug with disappearing handles of Bline-tool when zoom"

This reverts commit b2c0bca34f70b181a81c920ae3f000b4d6d1e675.
Fix #617:	Impossible to edit String-type parameter in the Params Panel
Revert "Fix warning: 'synfigapp::Action::Group::set_param' hides overloaded virtual functions"

This reverts commit 4fffbd907efd34eacd8e3935d0a916208d818702.
Use Simple label for preferences button
Save menubar and toolbar status(visible or invisible).
Use simplified button label for Restore Default Setting of Preferences dialog.
Reorder Show Menubar and Show Toolbar menu entries and some code re-finement.
Merge https://github.com/synfig/synfig