Ref.: add details; fix "line.main" in example

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1128 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
[finally commit] "estimate.variance" in fitCopula() and fidMvdc(): default is TRUE only if the iterations converged

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1129 edb9625f-4e0d-4859-8d74-9fd3b1da38cb