[WIP] deconstructPathRelativeToSWD

Addresses fixes to deconstructPathname (addresses issue #264). Introduces a new function deconstructPathRelativeToSWD that finds the absolute path to a given path name relative to a specified working directory (swd).
It'd be nice if we could somehow simulate interesting values for these cwd's. I presume their values are probably `x:\` and `y:\`.