Ensure maximum length of last job status
Ensure maximum length of last job status

The field jLastStatusText of the Jobs table and the field jlMessage of
the JobsLog table have a maximim length of 255 chars: let's ensure that
the saved value doesn't exceed this limit.

Former-commit-id: 2d1e3815be7f64d2e4377fc6d7427c33ba1e8060
a3020/concrete5,hissy/concrete5,biplobice/concrete5,hissy/concrete5,haeflimi/concrete5,olsgreen/concrete5,triplei/concrete5-8,concrete5/concrete5,mlocati/concrete5,haeflimi/concrete5,deek87/concrete5,acliss19xx/concrete5,mlocati/concrete5,rikzuiderlicht/concrete5,KorvinSzanto/concrete5,acliss19xx/concrete5,KorvinSzanto/concrete5,a3020/concrete5,concrete5/concrete5,MrKarlDilkington/concrete5,haeflimi/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,hissy/concrete5,concrete5/concrete5,mlocati/concrete5,rikzuiderlicht/concrete5,mainio/concrete5,mainio/concrete5,olsgreen/concrete5,triplei/concrete5-8,biplobice/concrete5,deek87/concrete5,deek87/concrete5,acliss19xx/concrete5,jaromirdalecky/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,KorvinSzanto/concrete5,jaromirdalecky/concrete5,MrKarlDilkington/concrete5,triplei/concrete5-8,mlocati/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,MrKarlDilkington/concrete5,concrete5/concrete5,mainio/concrete5,deek87/concrete5,hissy/concrete5,biplobice/concrete5