Issue1535

[BoPeng]

#1535

Changes:

1. Remove 'R' formatter
2. Remove remote target type
3. Remove function sos remote push and sos remote pull.
4. Stop interpreting paths in configuration file.
5. Stop supporting named path (e.g. #home because we now assume home will be the same across hosts`)
6. Stop converting paths like workdir because they are supposed to be the same across hosts.

[BoPeng]

Failed (ignored) tests so far.

test_remote.py::test_to_host_option
test_remote.py::test_to_host_option_with_named_path
test_remote.py::test_remote_execute
test_remote.py::test_remote_exec
test_remote.py::test_remote_exec_named_path
test_remote.py::test_remote_exec_workdir_named_path
test_task.py::test_override_max_cores
test_task.py::test_remote_input_target
test_task.py::test_delayed_interpolation
test_task.py::test_remote_output_target
test_task.py::test_remote_output_target_with_trunksize
test_task.py::test_sync_master_task
test_task.py::test_sync_input_output_and_rerun