flanders_report_generic.sty: use still higher tolerance *

This value protects even better against overfull lines; this solved an extra case of
overfull line in bibliography with long URL in reference.

inst/local_tex/tex/latex/inborapport_2015/flanders_report_generic.sty

@@ -708,7 +708,7 @@
 
 \hbadness=10000                     % badness above which bad hboxes are shown.
 \vbadness=10000                     % badness above which bad vboxes are shown.
-\tolerance=1000                      % badness tolerance after hyphenation.
+\tolerance=1500                      % badness tolerance after hyphenation.
 \hyphenpenalty=1000                 % penalty for line break after discresionary hyphen.
 \pretolerance=200                   % badness tolerance before hyphenation.
 \clubpenalties=4 10000  5000 2000 0   % penalty for creating a club line at end of line.