add some comments about Table breaker

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/gsoc2013tables@33201 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6
add some method for Table header UI

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/gsoc2013tables@33202 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6
add debug info and fix code style

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/gsoc2013tables@33206 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6
draw header at the beginning of _brokenDraw

git-svn-id: svn+ssh://svn.abisource.com/svnroot/abiword/branches/gsoc2013tables@33222 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6