Set up Summon connection to use dependency injection for logging; improved log output; expanded some comments.

Access WorldCat connection via service manager; added missing comments; switched logging to use dependency injection.

Load WorldCatUtils through service manager; set up logging through dependency injection; fixed namespace bug related to File_MARC class.

Split searchspecs reading away from standard config reader; made new class non-static for service manager integration; updated tests to match.

Changed from static to non-static getNew/getExisting list methods (in preparation for service locator).

(Rolling back changes we are not ready for quite yet).

This reverts commit 81f586eb.

Fixed some stats-related bugs and began preparing for service locator driver loading (moved logic out of constructor, eliminated static methods).

Added plugin manager for link resolver drivers; changed resolver connection class to use dependency injection and to eliminate unnecessary complexity.