[BZ-1007529] fix the findEndOfMethodArgsIndex() + add several tests
(cherry picked from commit c5df0eff84c72e8cc2b2e8c6f133313d40d57cc2)
[BZ-967609] fix cached value reading for dtables + replace corroupted XLS dtable

 * XLS dtable was corrupted because of Open(Libre)Office issues - created new one
   using Excel and that one works
(cherry picked from commit 60b69f9701ba94e63c15f80f83c25258af808815)
[BZ-986000] fix DRL to RuleModel unmarshalling
(cherry picked from commit fa78007ebbae6418d6e627a5d315b743e86a8e9f)