1. only when m_vHeaderRowNums.size() > 0 that m_bIsHeaderSet = true
2. refactor some function name and variable name

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/gsoc2013tables@33361 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6
pointer will be assign on PP_AttrProp::getProperty() 


git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/gsoc2013tables@33375 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6