Add Faunus-Cassandra widerows iterator support

Faunus no longer unconditionally sets cassandra.input.widerows to
false inside TitanCassandraInputFormat.setConf.  The rest of the
changes in this commit commit are comment and formatting tweaks in
around the same code.
Update recovery.txt

Manual cherry-pick of 25e9bde561557a6e10978c19b263a228daf42a29 which
seems to have been applied unintentionally on master
Update partitioning.txt

Manual cherry pick of dd536a366bdb8124db24d16f7555013c8f2cd626 which
seems to have been applied unintentionally on master