move Contributors (which is not a valid DESCRIPTION field) to a new THANKS file.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/blotter/pkg/FinancialInstrument@1476 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
replace paste0 with paste(..., sep="")

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/blotter/pkg/FinancialInstrument@1477 edb9625f-4e0d-4859-8d74-9fd3b1da38cb