nua: added NUTAG_M_DISPLAY(), NUTAG_M_USERNAME(), NUTAG_M_PARAMS() and NUTAG_M_FEATURES().
These tags are used to modify the Contact header generated by the stack in the nua_handle_contact_by_via() header. Currently, the tags only affect Contact header generated for registration. Updated internal outbound interface in order to make use of the new features. darcs-hash:20060913135519-65a35-6531f086bb5e7f454e568ebb144768163a6bb4c9.gz
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