Adding D7 on Mega as Servo pin for better compatibility with existing FC's

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1673 02679b44-d973-9852-f2fa-63770883b36c
Typo

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1677 02679b44-d973-9852-f2fa-63770883b36c
- 14 bytes less in MS baro computation (http://www.multiwii.com/forum/viewtopic.php?f=8&t=4246&p=51412#p51412)

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1678 02679b44-d973-9852-f2fa-63770883b36c
- better accuracy for InvSqrt thanks to new coeff and 8 bytes less (http://www.multiwii.com/forum/viewtopic.php?f=8&t=4246&p=51412#p51412)

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1679 02679b44-d973-9852-f2fa-63770883b36c