remove outdated man page info

the man page requests a new feature. I added the
feature in 2007 and didn't update the man page.
allow clarkeinv to rotate the vector

clarkeinv converts an x-y vector to three-phase.  Many
applications require rotating the vector.  Added a theta
input pin to rotate by an angle - default value is zero
and works just like before
allow for floating point in the base thread

when motion creates the base and servo thread,
the base thread doesn't support floating point.
When using brushless DC motors, it is desireable
to run the bldc component faster than the servo
thread, but it needs FP.  Added an module parameter
to motion that tells it to create a floating point
capable base thread.  Default behavior is the same
as before, so change is transparent.
pyvcp dial widget: fix various odd behaviors

Changing the increment under certain conditions would
result in an un-commanded change in output value.  Also,
some patterns of increment and value changes could result
in a value well outside the specified min and max limits.