merge lost change from commit:7de1e8b
typo bug fix for the label of many-to-many type control
fix some undefined variables issues in the new QSimpleTableCheckBoxColumn
Merge pull request #399 from vakopian/manytomany-type-control-label-fix

typo bug fix for the label of many-to-many type control
Merge pull request #400 from vakopian/SimpleTableColumn-undefined-vars

fix some undefined variables issues in the new QSimpleTableCheckBoxColumn