export permutest.protest
summary of permustats failed with a vector of permutations

Function assumed that permutations are in a column matrix (one
column for each statistic). Now vectors of a single statistic are
coerced to a column matrix. The summary failed with the following
results: anosim, mantel (+ mantel.partial), mrpp and permutest.cca.
Merge pull request #56 from jarioksa/permustats-fixes

Permustats fixes