Changeset 2450 for trunk/LMDZ.MARS/util/lslin.def

Mars GCM:
Changes in lslin.F90 :

• make sure the interpolation takes into account potential missing values in the input file fields, especially when the average/binning option is not used (ticket #68)
• enable the averaging option even when the Ls timestep is set automatically /!\ previous lslin.def must be updated in consequence !
• code clean-up, especially remove duplicates on controle field and altitude units
• replace all the tests "if (ndim.ge.3) then" by a unique test at the beginning of the var loop
• change "title" attribute into "long_name" by default (ticket #48)

+ add an indicative updated lslin.def
+ update util/README

AB