Add FluoView OIF Stitcher to menu.
Add description.
Start restructuring, standalone tools should go to "contrib".
Restructuring: move tracking tools to "contrib".
Restructuring: add readme explaining "contrib".
Restructuring: move WingJ tools to "contrib".
Restructuring: move sandbox to separate directory.

As the scripts and macros in there should not be distributed via our update
site, they are best kept in a separate place outside the "plugins" dir.
Restructuring: separate .jar for bars, use dist/ to collect assemblies.
Clean up ignore list.
Restructuring: separate tools from their dist.
Restructuring: update Makefiles for new "tools" JAR.
More consistency for Makefiles.
Add warning about missing libs to Makefile.