OSSP var

 o New feature: allow var_expand (or with a new function
   based on var_expand like var_printf) to first substitute printf-style
   %x constructs and then the OSSP var constructs. This allow more
   flexibility in expanding templates, because one can expand indices
   and other dynamic stuff into the template inside variable constructs.
   Think about var_printf("${array[%d]}", i); 

 o document exception handling