Lock-up

SWAN lock-up commands

rompy.swan.components.lockup.COMPUTE	Start SWAN computation.
rompy.swan.components.lockup.HOTFILE	Write intermediate results.
rompy.swan.components.lockup.COMPUTE_STAT	Multiple SWAN stationary computations.
rompy.swan.components.lockup.COMPUTE_NONSTAT	Multiple SWAN nonstationary computations.
rompy.swan.components.lockup.STOP	End of commands.