Remove dependency of charsets (in my_init) to get smaller binaries when charsets are not used
Simple code cleanup


client/mysql.cc:
  Fixed indentation
include/my_sys.h:
  Move init_compiled_charsets to own file
include/mysql.h:
  Remove compiler warning	
libmysql/Makefile.shared:
  Move init_compiled_charsets to own file
mysys/Makefile.am:
  Move init_compiled_charsets to own file
mysys/charset.c:
  Move init_compiled_charsets to own file
mysys/my_init.c:
  Remove dependency of charsets
scripts/mysql_create_system_tables.sh:
  Remove run time warning
scripts/mysql_fix_privilege_tables.sql:
  Add help tables
sql/sql_insert.cc:
  Code cleanup