flag is sent to server with placeholder types.
There were no need to extend the protocol as one additional byte
was reserved for placeholder code, when placeholder code is in range 0-255.
So this byte is now used for flags. Post-review fixes added.


include/config-win.h:
  added floaststore implementation
include/my_global.h:
  added floatstore implementation
include/mysql.h:
  Bug#3035:
  added 'is_unsigned' member
  binary_data wasn't used, removed
  null_field wasn't necessary, removed
include/mysql_com.h:
  Unused defines were removed.
libmysql/libmysql.c:
  Function store_param_type was removed - too much for a function, especially
  with bug in it.
  New implementation is inline and takes into account signedness of 
  placeholder.
  Fixed store functions to not perform double network-host order conversion
  on high-byte-first systems (should also fix Bug#3578 "Prepared statement 
  integer conversions work wrong in 64-bit Power Mac G5 CPUs").
  null_field removed.
sql/sql_prepare.cc:
  Placeholder sign is taken into account when reading data from network.
tests/client_test.c:
  Test for BUG#3035 added: insert and retrieve minimum and maximum of all
  integer types.