Removed compiler warnings.


Build-tools/Do-compile:
  Simple cleanup
include/mysql.h:
  Use #include "" instead of include <>
mysql-test/t/innodb_handler.test:
  Documented test
  Change to be runnable from mysql
sql/mini_client.cc:
  Removed dead code
sql/mysqld.cc:
  Changed relay_log_space to ulonglong
sql/slave.cc:
  Changed relay_log_space to ulonglong
  Removed dead code
sql/slave.h:
  Changed relay_log_space to ulonglong
sql/sql_acl.cc:
  Removed not used variables
sql/sql_base.cc:
  Removed not used variables
sql/sql_cache.cc:
  Removed not used variables
sql/sql_select.cc:
  Removed not used variables
vio/vio.c:
  Re-order include files to remove compiler warnings