Minor format type specifier fixes.

Use `%u` for `unsigned`.

git-svn-id: http://peerblock.googlecode.com/svn/trunk@720 d3e0e2f6-51e0-11de-b413-c5e99dc0a8e2
pbfilter_base.cpp: no need to check for `unisgned` < 0 since it can't happen.

git-svn-id: http://peerblock.googlecode.com/svn/trunk@721 d3e0e2f6-51e0-11de-b413-c5e99dc0a8e2
Initialize variables in the constructor.

git-svn-id: http://peerblock.googlecode.com/svn/trunk@722 d3e0e2f6-51e0-11de-b413-c5e99dc0a8e2