Avoid forbidden character on excel sheet name

src/main/java/plugins/stef/roi/quantify/PathIntensityProfiler.java

@@ -224,8 +224,8 @@ public class PathIntensityProfiler extends EzPlug implements Block, EzStoppable
         for (ROI roi : rois)
         {
             // create a sheet for each ROI
-            final IcySpreadSheet sh = new IcySpreadSheet(
-                    result.createSheet(roi.getName() + String.format(" - S%04d", Integer.valueOf(roiIndex))));
+            final IcySpreadSheet sh = new IcySpreadSheet(result.createSheet(
+                    roi.getName().replace(':', '_') + String.format(" - S%04d", Integer.valueOf(roiIndex))));
 
             // write columns headers
             int indCol = 0;