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fix gantt  print ff ie
Lowercase properties for SVG elements in order to workaround jquery svg plugin issue on firefox
A better implementation of critical path including grouping tasks (thanks to Julio Castro)
Fix on grid resize
cleanup
New layout
Gantt saves last splitter position and zoom
cleanup
Changed link check in order to remove invalid dependencies while loading project.
 Invalid dependencies are removed, but to loading process now continue.
cleanup
cleanup
new screenshot