fixing frequency label issue #176
moving xhistogram to histogram
fixing comment induced bug in tally (inf loops)
explicit reference to lattice::histogram
xhistogram <- histogram
scrub xhistogram from examples, etc.
version bump
rewrite tally() as non-generic function.
use formulas in prop() tests
blank line at end of file.
add documentation for xlab
turning off tests for tally -- temporarily?
remove doc for unused formula
turning off '... passes through table()' tests