
Things should/could be done in 1.x releases:
    * cover as much as possible code with tests
    * IsLast is not consistent(see t/01records.t)
    * LoadFromHash doesn't return any errors as other Load* methods do
        ** it should report back missing PK fields
    * Don't prevent DBI from die or reporting errors, now we have control
      with RaiseErrors and PrintErrors in Handle.pm. We should just check
      for $sth is defined and check $sth->err if fetch* methods returns undef.
        ** partly fixed
    * Count&CountAll:
        ** Count should always return how much rows we can fetch with Next,
           using pages affect this.
        ** CountAll should always return how many records we can fetch with
           applied conditions no matter use we pages or not to fetch it.
        ** document differences of the methods
    * More support for compound PKs.

Known bugs:
    * CountAll corner case:
        * new collection
        * CounAll returns 0
        * Limit collection
        * CountAll returns correct value
        * UnLimit or apply other limit(only change must_redo_search)
        * CountAll returns old value

        Could be fixed in one line change in CountAll sub, but interfere with
        Pages. When you call NextPage or other page walking methods
        must_redo_search bcomes true also so CountAll after NextPage force
        useless query.

    * Class::ReturnValue is prefered way to handle errors, should implement
      it in all error paths.
    * rework&review pages support, now I can't write next code:
      while( $records->NextPage ) {
        while( my $rec = $records->Next ) {
          ...
        }
      }

    * New methods: Prev, Current. Refactor collection walking:
        ** $sb->{itemscount} can be undef, what means that we are in the begin
           or end of the set.
        ** Current, returns undef if $sb->{itemscount} is undef, in other case
           returns record from array using $sb->{itemscount} as index.
        ** IsLast and IsFirst return undef if Current is not defined, and
           return 0 or 1 in other cases.
        ** First and Last - work as before, return undef or object.
        ** GotoItem supports undef as argument and returns undef or object.
        ** Next walks forward, returns first object if Current is undef,
           if there is no Next in set drops $sb->{itemscount} to undef and
           returns undef.
        ** Prev walks backward and works like Next, but if Current is undef
           it starts from Last record.


Parameter naming:


    Inside the object relational mapper (Jifty::DBI),
    when refering to a column, the parameter is called:
    
    'column'.

    It is NOT called:

    'field', 'key', 'col', etc .

