
Merging seaice_growth codes -- part 2 -- actual changes.

- consitently compute QI (hardcoded as 3.02 _d 8 before) as
 Lfusion*SEAICE_rhoIce (3.039 _d 8 using defaults) and
 QS (1.1 _d 8 bfore) as Lfusion*SEAICE_rhoSnow (1.102 _d 8 now),
 with Lfusion=3.34 _d 5.
- in flooding, use rhoConst (rather than 1000.) for sea water density.
=> These constants changes obviously changes all results significantly,
=> so all the relevant experiments results will be updated.
- couple of small cosmetic changes included.

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