Use noop deleter when cleaning secondary indexes if they haven't gone through post construction yet.
Pass deletion_context_t's to make detaching/deletion work properly. Fix detaching problem when dropping incomplete sindexes. Make btree splits detach values.
Style fix.
Merge branch 'daniel_2073' into daniel_2073_debug

Conflicts:
	src/btree/btree_store.cc
	src/btree/erase_range.cc
	src/btree/erase_range.hpp
	src/rdb_protocol/btree.cc
	src/unittest/btree_sindex.cc