Integrate backtrace in MolDSException::what(). #31491

git-svn-id: https://svn.sourceforge.jp/svnroot/molds/trunk@1408 1136aad2-a195-0410-b898-f5ea1d11b9d8
Add a linebreak after error description. #31712

git-svn-id: https://svn.sourceforge.jp/svnroot/molds/trunk@1409 1136aad2-a195-0410-b898-f5ea1d11b9d8