PhoneNumberHelper.java: Disable SMS

Part of fixing barrykn/android-cm7-bkndh1#9.
People: Make the search button play dead

Until I figure out how to make the search button disappear altogether,
it will suffice to make it just do nothing.

Part of barrykn/android-cm7-bkndh1#10.
PeopleActivity: Make search button go away forever, for real

I've tested this, so I can now close barrykn/android-cm7-bkndh1#10.
Merge branch 'cm-10.0.0-bkn' into cm-10.0.x-bkn

I've merged all of my trivially mergeable changes from CM 10.1 back to
10.0, and now I'm merging those from the 10.0 release to the current
10.0 tree.