Changed name of function my_correct_default_file to
modify_defaults_file. Improved function and fixed some
bugs in it.


include/my_sys.h:
  Changed function name.
include/mysql_com.h:
  New function, modify_defaults_file()
libmysql/Makefile.shared:
  New file, default_modify.lo
libmysql/libmysql.def:
  New function, modify_defaults_file() and fixed version number.
libmysqld/libmysqld.def:
  New function, modify_defaults_file()
mysys/Makefile.am:
  New file, default_modify.c
mysys/default.c:
  Removed function from default.c. New, corresponding one is in default_modify.c,
  name is modify_defaults_file.
server-tools/instance-manager/commands.cc:
  Changed function name.
sql/mysqld.cc:
  Fixed typo.