Modification of Corr to accomodate ranked correlation

Could you please make sure I didn't screw this up.

Thx.

@nevensf
@mmenegoz

Develop load esa

Changes in path for ESA and E-OBS data for /cfunas structure. Please merge :)

Develop load esa

Added line to load ESA tos and sic into IC3.conf. No testing needed

Need to transpose varbis and flag to make sure they have consistent dimensions with the current PlotEquiMap and PlotStereoMap

Allows to draw a rectangle over a portion of the map drawn by PlotEquiMap

Could you please check to make sure I didn't screw this up?

Thx,

LP

@cprodhomme
@apinto

Specification of the atmospheric grid for the interpolation of the observations; should be found by Load automatically and therefore unecesary but does not work properly; hence this workaround

Extension of Year option so that it can plot maps for the whole set of months available within a year even if incomplete

This reverts commit 7b958b9d.

Develop upgrade to 2.3.2

Ready to release 2.3.2