This class handles the persistence of complibs in different installation scopes. Conceptually
there is a USER scope, a SYSTEM scope (to be implemented), and a scope for each project.
Maintains sets of ExtensionComplib-s per scope and also maintains a list of directories in an XML
file.
author: Edwin Goei
Install an existing complib into this scope and return the newly installed complib.
Parameters: srcComplib - source complib throws: IOException - throws: ComplibException -