Integrated arg name into InstallationFinder searching methods
Refactored tools to use InstallationFinder#defaultHomeDir
Added java.lang.Exception to throws clause of Tool#handleCliOptions
Uncaught exceptions thrown by Tool#handleCliOptions will be fatal
Restricted scoping of DS1Reader constants specific to class impl to reduce confusion
Restructured DS1Reader a bit
Added support for DS1#layers bitsum of active layers
Implemented multiple layers into Chunk#tiles via Chunk#layers
Changed MapDebugger to y-up be north (more logical with level layouts and ds1 coordinates scheme)