Statistics::Data used as base so that "series testing" can be relegated to that module; so the module's own series_XXX() methods are gone; see the POD for support

Math::Cephes used for normal probability functions for greater precision. See p_value() description in the POD.

p_value() method can, if given the same args as zscore(), calculate the zscore itself and return only the p-value, rather than having to be given the z-value.

p_value() return value corrected for the case when zvalue = 0 and tails is optionally set to 1. Would return 1 (appropriate for the default 2-tailed setting), but now correctly returns 0.5 in this case.

'pvalue' is now an alias for calling p_value()

values returned from zscore() and p_value() are no longer cached within the class object (was probably only useful for "series testing", which is now handled as above).

ccorr() method added to read or return default value used for ccorr on all tests if none is given within them (default is still 0).

'ccorr' option no longer just accepts a boolean value: its actual value is implemented; it is no longer just assumed to equal 1 if defined. See OPTIONS in the POD.

tails() method added to read or return default value used for tails on all tests if none is given within them (default is still 2).

dump() method now works just like zscore() and (as now revised) p_value(): given observed, expected and variance values, will calculate the z-score and p-value itself, ahead of printing them to STDOUT. Previously it relied on the cached values from a previous call to the former methods, which is no longer useful.

result_string() method added: this returns what is printed by dump() but without the terminal newline character.

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