reworking intrinsic procedures

[FX Coudert]

> We have a code which supports using e.g. integer*8 as the "default"  
> for many variables.  Requiring the user to convert arguments to the  
> default integer kind first would be annoying.  Having the compiler  
> convert the arguments to the default integer kind would be fine,  
> since -- likely -- the implementation of the intrinsic would do  
> that anyway internally.

Two more things I should have said in my previous mail:

   * Due to the early release of 4.2.0, it will be a 4.3-only work,  
as it will change library ABI
   * As it will probably require to write code for translation of  
each intrinsic in trans-intrinsics.c, it's probably a good time to  
also think about passing the INTENT(IN) arguments of these intrinsics  
by value, instead of by reference. It will help the compiler by  
reducing the number of adressable variables.

FX