some notes about coding standards to ensure portability

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@421 48e7efb5-ca39-0410-a469-dd3cf9ba447f

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+**
+** Random bits about coding standards and portability
+
+MALLOC:
+ You must cast the result of malloc on AIX. 
+ It's even better to use gras_new when possible.
+
+SIZE_T
+ #include <sys/types.h> in all files manipulating size_t
+ do cast it to unsigned long before printing (and use %lu)
+ 
+