compare compare_items<T>
handler item_handler<T>
iterators used to iterators sets of journal objects
filters derived from item_handler, they morph the result set
output derived from item_handler, these do the printing
Also, created a new 'help' files which contains just Ledger's help text.
except for several unused parameter warnings (because there is so much code
still #if 0'd out), and one implicit conversion from long long to long which
still has to be dealt with.
