refactor getHoldings.WisdomTree.  WisdomTree changed webpage format



git-svn-id: svn://scm.r-forge.r-project.org/svnroot/twsinstrument/pkg/qmao@399 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
 pass variables to internal functions

git-svn-id: svn://scm.r-forge.r-project.org/svnroot/twsinstrument/pkg/qmao@400 edb9625f-4e0d-4859-8d74-9fd3b1da38cb