cxroot module not working anymore after update to latest master

Tanguy introduced a new common block containing the air composition parameters some time ago:

double precision airz,aira,airw,airavz,airava,airi
      common/cxair/airz(3),aira(3),airw(3),airavz,airava,airi(3)

This needs to be properly set by us before calling conex::initconex_(). Otherwise it causes a crash in DBRELM().

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