[Patch, fortran] PR31879 , PR31197 , PR31258 & PR32703 - various character problems

[Dominique Dhumieres]

I have applied (partly by hand) the patch sent privately by Tobias Burnus.
Apparently I did not make too many mistakes as now PR32703 pass.

> It should be noted that, although PR32703 is fixed, the code that is generated is not correct. Try:
...

For the code g95 gives:

At line 6 of file pr32703_1.f90 (Unit 6)
Traceback: not available, compile with -ftrace=frame or -ftrace=full
Fortran runtime error: Inconsistent string size in array constructor

Dominique