Varying fields in debug

Hi John - I played with this some (needed a break from beating my head into
a brick wall - the wall and myself are both feeling much better now!)

You can in fact do an Eval varyfield = X'0000' and the whole field will be
reset to blanks with a zero length!  Why the debugger won't take eval
varyfield = '' (i.e. null string) I have no idea.

You can get a hint as to why this works by doing an eval with the :X
extension.  For example if I say Eval varyfield = ' ' then doing a straight
eval of that field shows spaces.  If however I use eval varyfield:x then
what I see is "000140.........." in other words use of the hex option makes
it take the length portion into account.  I presume that when you set it
using the hex option it makes the same assumption i.e. that the first four
digits are the length piece - neat eh!

Don't know if its documented anywhere but I'm sure going to remember it!

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