Search for some ACE file name in the command line arguments.
When some argument has the appropriate suffix (ie. ".ace" or
".ACE"), the ace parser is automatically launched in order to
parse this configuration file. The caller is then notified
that we are now in ACE mode (the result is True). When we are
in ACE mode, remainings allowed argument are automatically
Append in str the Eiffel coding of the character (Table in chapter 25 of ETL, page 423).%%%%%%%%
When the % letter notation exists, it is returned in priority: '%N' gives "%N", '%T'
gives "%T", etc.
When % letter notation does not exists (not in the ETL table), numbered coding is
used ("%/1/", "%/2/" etc).