use "." as the one letter code for water molecules

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2715 5a81b35b-ba03-0410-adc8-b2c5c5119f08

modules/seq/base/src/impl/sequence_impl.cc

@@ -36,7 +36,7 @@ namespace {
 
 bool is_sane_code(char code)
 {
-  return (isalpha(code) || code=='?');
+  return (isalpha(code) || code=='?' || code=='.');
 }
 
 }

modules/seq/base/tests/test_sequence.cc

@@ -56,7 +56,7 @@ BOOST_AUTO_TEST_CASE(seq_triv)
 {
   BOOST_CHECK_NO_THROW(CreateSequence("S1", "-afbcdefghijkLMNOPQRSTUV-"));
   BOOST_CHECK_THROW(CreateSequence("S1", "1"), InvalidSequence);
-  BOOST_CHECK_THROW(CreateSequence("S1", "."), InvalidSequence);
+  BOOST_CHECK_THROW(CreateSequence("S1", "*"), InvalidSequence);
   BOOST_CHECK_THROW(CreateSequence("S1", " "), InvalidSequence);
   SequenceHandle s=CreateSequence("S1","-afbcdefghijkLMNOPQRSTUV-");
   BOOST_CHECK_EQUAL(s.GetString(),"-afbcdefghijkLMNOPQRSTUV-");