Log Message:
abook: Update abook to 0.6.1

0.6.1
 - custom output format (Rapha�l Droz)
 - remove duplicates (Fabio Zanini)
 - merge entries (Fabio Zanini)
 - mutt groups support (Fabio Zanini)
 - vcard initial input filter (Michael Krolikowski)
 - vcard parser improvements (Fabio Zanini, Rapha�l Droz)
 - color support (Thorsten Wi?~_mann)
 - mouse support (Thorsten Wi?~_mann)
 - extra-fields deletion bugfix (Jorrit Tijben)
 - additional keybindings (Hagen Fuchs)
 - autotools update (Fabio Zanini)
 - case-sensitive ldif fields parsing (Christian Brabandt)
 - ldif standard input support (Rapha�l Droz)
 - ldif extensible field management rewrite (Rapha�l Droz)
 - html output fixes (St�phane Aulery)
 - memory bugfixes (Peter Wu)
 - vcard birthday export fix (Gaetan Bisson)