[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).
Since `deconstructPathRelativeToSWD` doesn't return an `isAbsPath` boolean, the `isAbsPath = true` can be removed on this line and similar lines below.