support for unsigned and moving fieldName from Field to Structure

[Marty K. <mrk...@co...>]

On Monday morning Matej and I plan to start work on the cionversions.
As soon as Matej says the all the mercrial tags are in place I will start.

Our plans are:

Matej puts tags in place.
Marty  start on pvDataJava
     implement unsigned first
     next move fieldName
     serialze/deserialize left for Matej
     commit and push (may be some  commits and pushes before all ready 
so Matej can start on serialize/deserialize)
Matej will start on pvDataJava and pvAccessJava
Marty will start on pvIOCJava
When all of pvDataJava, pvAccessJava , and PVIOCJava are ready Matej and 
I will follow a similar schedule for The C++ version.