This is the addition of the CSV engine "aka tina". Its an example engine that works as a plain text file. 


acconfig.h:
  Adding HAVE CSV rule
acinclude.m4:
  Build option of csv engine
configure.in:
  Update for building CSV
sql/Makefile.am:
  Added files for CSV build
sql/handler.cc:
  Needed options for CSV to be created.
sql/handler.h:
  CSV type engine enum.
sql/mysql_priv.h:
  Addition of the have_csv_db variable.
sql/mysqld.cc:
  Code to show csv option.
sql/set_var.cc:
  Adding have show variables for both csv and example.