Print Methods
 * Created print.ldBounds: almost identical to summary 
        (just leaves off the exit probabilities)
 * Created print.ldPower: almost identical to summary
        (just leaves off the exit probs, and puts the
        lower/upper probs up with the boundaries, instead
        of separating)
 * Edited summary.ldPower: to give power when drift is
        known (put space before probs table)Better two-sided bounds and defaults rather than weird parameters
 * Created sides argument for ldBounds
 * Added ability to specify the number of looks, which
        then automatically creates equally spaced analysis
        times
 * Sides=2, but with only one alpha, etc, creates
        symmetric bounds, splitting the provided alpha in
        half for each, upper and lower bounds
 * Print and summary functions updated to account for
        thisldPower to use output from ldBounds
 * ldPower can now accept an ldBounds object as the first
        argument, in which case, it does not require za,
        zb, t, t2
 * Defaults to drift=0 when nothing is specifiedNominal alpha level at each look provided (for one-sided or symmetric bounds)
 * ldBounds now has additional value: nominal alpha at
        each look.
 * Summary.ldBounds displays thisasf changed from asf/alpha to asf
 * asf now uses just asf rather than asf alpha (this
        was only a change to alphas function)Weird integer errors
 * ldBounds and alphas now have checks that take into
        account floatsAbility to specify non-alpha spending boundaries
 * Created new function commonbounds to calculate
        Pocock or O{'}Brien-Fleming (non-alpha-spending)
        bounds at equally spaced times.
 * These also become ldBounds objects
 * Adjusted print and summary functions to accommodateCalculate adjusted p-values
 * Added p-value functionality to ldPower function;
        stepwise and likelihood ratio ordering available.
 * Uses a new adj.p function which, ironically, calls
        ldPower.
 * Edited printing and summary functions to use this
        as well.Graphics
 * Now uses base graphics, very simple
 * Option to show on either z-value or b-value scale
 * Ability to add to existing plotConditional power
 * Added condpower, a function to calculate simple
        conditional power