[Patch] address book header bar configuration

[Albrecht Dreß <albrecht dress arcor de>]

Hi all,

attached is a small patch recognising the header bar configuration in the address book widgets, i.e. disable 
header bars in them if the environment variable BALSA_DIALOG_HEADERBAR is 0.

Opinions?

Cheers,
Albrecht.

Attachment: addressbook-headerbar.diff
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Attachment: pgpEXaxVGD5Dh.pgp
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