Add missing entry descriptions

[gold2718]

Every entry in namelist_definition_drv.xml should have a description. These entries are missing one:

• write_restart_at_endofrun
• Profiling
• MED_model
• XXX_model (for XXX = ATM, OCN, ICE, ROF, LND, GLC, WAV)
• Verbosity@xxx_attributes (or xxx = med, ice, glc, lnd, ocn, rof, wav)
• histaux_wav2med_file1_auxname