Minor inconsistency in the column names of the anova.coxph output

[Feakster]

When a single object is specified in anova.coxph() the column names of the output are:

"loglik, Chisq, Df, Pr(>|Chi|)"

However, when two objects are specified the column names of the output are:

"loglik, Chisq, Df, P(>|Chi|)"

[therneau]

Now fixed