chemnitz/sisis: fix multi pages
digibib7: show  error messages if search has errors
verl/koha: do not show useless error message when there are no search results
bibdia: if accessing lendings through user.C fails, try login.C, too
fix possible Android crashes: update okhttp:3.12.8 to okhttp:3.12.13, do not try to parse command line
do not rescale images by less than 20%
fix TH Neu Ulm
