Default Input Path Quality of Life Improvement

[a3ng7n]

Looks for input files relative to the executable path instead of cwd. Since all examples in this fork have been moved to examples/, the default behavior is to set InOutPath to /path/to/42/examples/InOut/.

Still retains argument functionality; i.e. argv[1] and argv[2] can still be used to set the input file paths to arbitrary directories. Further, the original functionality of defaulting to looking at cwd can be achieved by accordingly setting the DEFAULT_CASE_PATH/DEFAULT_MODEL_PATH variables in the makefile.

Functionality when compiling with the RBTFLAG is unaffected.

Also adds a couple helper functions to iokit.