add avi export macro

exportAvi.ijm

+//This macro should be called in Fiji's headless mode e.g.
+// fiji --headless -macro /path-to-macro.ijm /path-to-file.tif
+// or by runMacro(macro, arg)
+// (apparently file path must be absolute)
+
+frameRate = 20; // set fixed frame rate TODO: read time resolution and calculate frate 
+outExtension = ".avi";
+
+inFile = getArgument();
+dotIndex = lastIndexOf(inFile, ".");
+if (dotIndex >= 0) {
+    baseName = substring(inFile, 0, dotIndex);
+}
+outFile = baseName+outExtension;
+// escape spaces in path with \ and "" // does not work!
+//outFile = "\"" + outFile + "\"";
+//outFile = replace(outFile, " ", "\\\\\\\\ ");
+if ( indexOf(outFile," ") >= 0 ) {
+    exit("Input path must no contain whitespace!");
+}
+//print("will export to "+outFile);
+
+setBatchMode(true);
+open(inFile);
+run("8-bit");
+run("AVI... ", "compression=JPEG frame="+frameRate+" save="+outFile);
+close();
+setBatchMode(false);