http://i2p-javadocs.i2p/net/metanotion/io/block/index/BSkipSpan.html
super X>, Y> void loadInit ( BSkipSpan <X, Y> bss, BlockFile bf, BSkipList <X, Y> bsl,
int spanPage, Serializer <X> key, Serializer <Y> val) I2P - first half of load()
Only read the span headers protected void lostEntries (int firstBadEntry,
int lastGoodPage) Attempt to recover from corrupt data in this span.