[fix] correction of bugs detected with new versions of compilers (nag and gfortran)

• With version 10.2.1 gfortran evaluate all the components of an if expression even if a previous component is false. An if expression is broken into 3 expression to avoid this problem.
• With version 7.1 nag check if the size of array arguments are the same in the declaration of a routine and its interface. So we had to change the size of TRA01 in the interface of PROPA.