Initial checkin of using udunits for measurement units conversions. Replaced
our conversion code in ICG and swig code to use udunits.
Also added code to convert unit symbols that we used in Trick that are different
names in udunits.
Added a sim_object that will eventually allow users to specify a custom
set of files to read units information.
refs #231
We need to exclude STL or other template io_src code being created with they use
a protected/private enumerations, just like classes. Also remove a check for
a static bitfield, because you can't have a static bitfield.
refs #218
Mostly working. This removes the use of offsetof from all I/O code. This was
the only reason we needed friends. In it's place we put the offset value that
clang has calculated for the field. Still need to work on virtually inherited
classes and confirm bitfields.
refs #218
