use $MAX_TABLES mysqltest variable to make join test portable
make test now works with the manager on IA64 Linux


client/mysqltest.c:
  added MAX_TABLES variable
libmysql/libmysql.c:
  portability fixes for 64-bit systems
mysql-test/mysql-test-run.sh:
  fixed bug - wrong values of -display in xterm in gdb mode
mysql-test/r/join.result:
  make test work on both 32-bit and 64-bit systems
mysql-test/t/join.test:
  make test work on both 32-bit and 64-bit systems
sql/mini_client.cc:
  64-bit portability fixes
sql/mini_client.h:
  64-bit portability fixes
sql/slave.cc:
  64-bit portability fixes
tools/mysqlmanager.c:
  64-bit portability fixes