HashTrieEngine: classes for leaves management were added. Now trie is compressed by removing 'straight paths'. Not everything is implemented yet
FileStorableDbEngineTest: checks for equality of size(), keySet().size() and entrySet().size() were added
HashTrieEngine: put() was completed, it should work now.
HashTrieEngine: storage pre-allocation was added
HashTrieEngine: pre-allocation procedure was fixed: if (notEnougSpace) was changed to while()
HashTrieEngine: now MappedByteBuffer is used instead of RandomAccessFile everywhere
BenchmarkClient: now it benchmarks HashTrieEngine
HashTrieEngine: separate package was created for it and its classes (dbfall2013.engines.hashtrie)
HashTrieEngineTest was enabled
README and INSTALL were updated due to the last changes
HashTrieEngine: fancy 4-byte signature was added to storage file instead of simple version int
README: information about different storages was added, storage format of LogFileEngine was documented