[osis-core] Error with xml:space in osisTextCT.

[Todd Tillinghast]

Patrick,

On osisTextCT xml:space is declared twice.  Once explicitly and once as
a part of globalWithType.  (If we declare the default value on <osis>
then we can simply remove the explicit declaration in <osisText>.)

While looking at the xml:space declarations, I noticed that you
specified default values.  I think we should only declare a default
value once at the very top and the default value should be "default" and
NOT "preserve".

By specifying a default value for xml:space within globalWithType and
globalWithoutType we will not get the inherited effect that is intended
because to a parser default values look the same as explicitly specified
values.

Todd