Re-application of patch to clean 5.0 tree. Fixed issue with ANSI quotes 
when dumping triggers


client/mysqldump.c:
  BUG# 13146
  
  Re-application of fix to clean 5.0 tree. 
  
  Added comments for quote_name, moved declarations into proper order, 
  unset MASK_ANSI_QUOTES flag in opt_compatible_mode global when dumping
  triggers
mysql-test/r/mysqldump.result:
  BUG# 13146
  
  New test results
mysql-test/t/mysqldump.test:
  BUG# 13146
  
  New test