Additional methods for literal index

[GoogleCodeExporter]

the literal index should have additional methods to select all occurrences, 
variants:

- with a numeric value in a defined range 
   getLongs(long from, long to)
   getIntegers(int from, int to)
   getFloats(float from, float to)
   getDoubles(double from, double to)
- with a time or date value in a defined range
   getDateTimes(Calendar from, Calendar to)

Original issue reported on code.google.com by Sven.Kro...@googlemail.com on 15 Sep 2010 at 8:17