lib/Bulgarian.isl,lib/Makefile.am,survex.iss.in: (Microsoft Windows
version) Include Bulgarian and Russian translations in the
installer.
NEWS,configure.ac: Update for 1.2.13.
tests/equatenosuchstn.out,tests/surveytypo.out: Update expected
output to match recent changes to messages.
tests/cavern.tst: Fix cavern.tst to run under valgrind during "make
distcheck".