Fixed up intent MIME-types, add Accounts menu, clean unused.

Cleaned up <intent-filter> entries for INSERT_OR_EDIT and
EDIT to watch for more MIME-types after legacy change-over.

Finished clean-up from display groups by removing deprecated
edit sync groups UI, and unused menu.  Changed
ContactsListActivity to use XML-based menus and added an
"Accounts" link that replaces the edit sync groups.

Finally, hooked up the INSERT case to read extras from any
incoming intents to help with SHOW_OR_CREATE intent testing.
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 2278761..050abf9 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -816,6 +816,9 @@
     <!-- Shown as the social status snippet for a person when no social updates exist. -->
     <string name="fasttrack_missing_status">No recent updates</string>
 
+    <!-- The menu item to open the list of accounts -->
+    <string name="menu_accounts">Accounts</string>
+
 <!-- TODO: add comments to each of these strings to prepare for translation -->
 <string name="nameLabelsGroup">Name</string>
 <string name="nicknameLabelsGroup">Nickname</string>