- unique I2C speed set once (400kHz), except for old WMP config (http://www.multiwii.com/forum/viewtopic.php?f=8&t=4270)

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1626 02679b44-d973-9852-f2fa-63770883b36c