Don't allow none of layer be created for circle tool.
Don't allow none of layer to be created for spline tool
Don't allow none of layer to be created for draw tool
Don't allow none of layer to be created for polygon tool
Don't allow none of layer to be created for rectangle tool
Don't allow none of layer to be created for star tool
Don't allow none layer to be created for text tool
Don't allow none of layer to be created for gradient tool
Merge pull request #128 from jcome/tool-options-panel-layer-creation

Don't allow none of layer be created (Tool options panel)
Fix loading of WeightedAverage list
reFix-161 - Align rows of Params Panel and Timetrack Panel

- add a CellRendererText to TimeTrackView with same font attribute
to have same rows height.
161 - Align rows of Params Panel and Timetrack Panel - test

- add a CellRendererPixbuf at end of TimeTrackView.
161 - Align rows of Params Panel and Timetrack Panel - Progress7

WARNING THIS IS A TEMPORARY COMMIT
who have a reference to a hard linked ressource (1x16 alpha icon)

- Add initial support of alpha icon inside timetrack dock's treeview
- Add a gtk::drawingarea widget inside the timetrack dock's to align the time cursors
161 - Align rows of Params Panel and Timetrack Panel - Progress8

WARNING : HARD LINKED RESSOURCE

- Add utils_timetrack_align_icon.sif file
- Update icon procedure to include utils_timetrack_align_icon.sif
- Create icon stock icon for utils_timetrack_align_icon.sif
Fix161 - Align rows of Params Panel and Timetrack Panel - End

- Use the registred icon "utils_timetrack_align" in place of hard linked
Fix:The (orange) timecursor gets invisible behind primary graduation

In Widget_Timeslider::redraw, draw the cursor after the graduation
161 - Align rows of Params Panel and Timetrack Panel - Debug

- Add some debug output into LayerTree::update_param_tree_header_height
to catch the gremlins
- Add a potential fix
161 - Align rows of Params Panel and Timetrack Panel - Debug2

- Add some debug output into Dock_Timetrack
161 - Align rows of Params Panel and Timetrack Panel - Progress9

- Fix stock icon ID : synfig-utils_timetrack_align (synfig- was missing)