Set default surface roughness option for gls and tke to nn_mxlice=0
(instead of 2), i.e. "no ice" case. Switched on the option in reference
configurations that do have sea-ice.

A few changes to chap_DOM.tex (still more to do) and resurrect namelists/namelist_abl_tools so that the manual will actually compile. PDF updated on sette_inputs site.