Date increments have usually higher values.
I had hoped to reduce the file size by a lot. But in my example data
with 44 million entries (real life data) it only reduced the storage
size by 1.5%.
Also fixed a bug in PdbReader that prevented other values for the
CONTINUATION byte.
Also added a small testing tool that prints the content of a pdb file.
It is not (yet) made available as standalone tool, but during
debugging sessions it is very useful.