4 Fixes for larger databases (tested up to one billion 100-byte entries,
7 (1) Place hard limit on number of level-0 files. This fixes errors
8 of the form "too many open files".
10 (2) Fixed memtable management. Before the fix, a heavy write burst
11 could cause unbounded memory usage.
13 A fix for a logging bug where the reader would incorrectly complain
16 Allow public access to WriteBatch contents so that users can easily