code: def filepaths(self) -> List[str]:
          
          path = self.currentpath
          return [os.path.join(path, name) for name in self.filenames]
docs: Absolute path names of the files contained in the current
          working directory.
  
          Files names starting with underscores are ignored:
  
          >>> from hydpy.core.filetools import FileManager
          >>> filemanager = FileManager()
          >>> filemanager.BASEDIR = 'basename'
          >>> filemanager.projectdir = 'projectname'
          >>> from hydpy import repr_, TestIO
          >>> with TestIO():
          ...     filemanager.currentdir = 'testdir'
          ...     open('projectname/basename/testdir/file1.txt', 'w').close()
          ...     open('projectname/basename/testdir/file2.npy', 'w').close()
          ...     open('projectname/basename/testdir/_file1.nc', 'w').close()
          ...     for filepath in filemanager.filepaths:
          ...         repr_(filepath)    # doctest: +ELLIPSIS
          '...hydpy/tests/iotesting/projectname/basename/testdir/file1.txt'
          '...hydpy/tests/iotesting/projectname/basename/testdir/file2.npy'