I don't see why we would need two different accessors for a public field.

Various functions throughout the codebase used it to grab settings. This
has to stop because I want to use them without reading the config file.

These functions can now be used without reading the config first:

* ethdb.NewLDBDatabase
* ethrepl.NewJSRepl
* vm.New

* Reimplemented caching for trie
* Reimplemented resetting and persisting trie

Change number of args passed to NewIterator in print function to reflect changes in the goleveldb project.