repod/action/task.py:
Change `WriteOutputPackageBasesToTmpFileInDirTask` to create a
subdirectory named "pkgname" in the management repository directory of a
repository and to add symlinks from the names of the packages of an
`OutputPackageBase` to its pkgbase into it.
Change `WriteOutputPackageBasesToTmpFileInDirTask` to expose the created
temporary files as absolute Paths in its filename attribute.
Change `MoveTmpFilesTask.do()` to use filenames of
`WriteOutputPackageBasesToTmpFileInDirTask` instances directly, as they
are now absolute Paths.

tests/action/test_task.py:
Change `test_movetmpfilestask_do()` to correctly work with the fact that
`WriteOutputPackageBasesToTmpFileInDirTask.filenames` now represent
absolute Paths.
Change `test_writeoutputpackagebasestotmpfileindirtask_do()` to
correctly work with the fact that
`WriteOutputPackageBasesToTmpFileInDirTask.filenames` now represent
absolute Paths.
Change `test_printoutputpackagebasestask()` to ignroe
comparison-overlap.