new flag? wml -U

[Jan Holler <nospam@thanx>]

I suggest to implement a flag -U to undefine previously with
-D defined variables.

Reason:
There is no way to unset such a variable as it is
possible within a file with <set-var> ... <unset-var foo>

e.g. if in an upper .wmlrc is -D BAR="foo" (since we need it 
there) and in a lower (cd into some subdir) .wmlrc we would
not want 'BAR' to be set, we cannot use such a construct
because 'BAR' is set und 'newbar' will never be $(WML_SRC_BASENAME):

<if <var-exists BAR>
<set-var newbar=<get-var bar>>           # or $(BAR) instead of <get-var bar>
<set-var newbar=$(WML_SRC_BASENAME)>
>


Cheers!
 -jan

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