Added explanatory error messages when there are db.xml problems during block type installation
Added explanatory error messages when there are db.xml problems during block type installation


Former-commit-id: e7ac0c1d982a0fd211a227f06ce802a4be89c490
haeflimi/concrete5,hissy/concrete5,KorvinSzanto/concrete5,mlocati/concrete5,acliss19xx/concrete5,deek87/concrete5,acliss19xx/concrete5,deek87/concrete5,haeflimi/concrete5,acliss19xx/concrete5,rikzuiderlicht/concrete5,MrKarlDilkington/concrete5,mlocati/concrete5,a3020/concrete5,a3020/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,concrete5/concrete5,biplobice/concrete5,olsgreen/concrete5,deek87/concrete5,MrKarlDilkington/concrete5,triplei/concrete5-8,rikzuiderlicht/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,biplobice/concrete5,olsgreen/concrete5,mainio/concrete5,concrete5/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,hissy/concrete5,haeflimi/concrete5,KorvinSzanto/concrete5,mainio/concrete5,deek87/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,biplobice/concrete5,rikzuiderlicht/concrete5,concrete5/concrete5,haeflimi/concrete5,hissy/concrete5,concrete5/concrete5,mainio/concrete5,mlocati/concrete5,triplei/concrete5-8,triplei/concrete5-8,hissy/concrete5,KorvinSzanto/concrete5