Added build file by Giovanni Mascellani.

Add in LGPL copyright notices to the osmpbf library.

Obsolete the Changeset Message.

Add in more error detection.

Don't sort the first 127 entries in the string table.

Gives a small .1% gain. In my design, I try to use the smallest integers as
much as possible so that deflate's entropy coder works more efficiently.

Excise references to now-obsolete Nodes