Added struct ParseMode to control parse behaviour.

- Introduce a very simple class ParseMode which will become a simple
   value object which can be used to control the behavior when errors
   and inconsistencies are encountered in the parse and EclipseState
   construction phases.

 - Added ParseMode instance as second argument to all parseXXX()
   methods.

opm/parser/eclipse/IntegrationTests/ParseTITLE.cpp

@@ -25,6 +25,7 @@
 #include <opm/parser/eclipse/Deck/Deck.hpp>
 
 #include <opm/parser/eclipse/Parser/Parser.hpp>
+#include <opm/parser/eclipse/Parser/ParseMode.hpp>
 #include <opm/parser/eclipse/Parser/ParserRecord.hpp>
 #include <opm/parser/eclipse/Parser/ParserIntItem.hpp>
 #include <opm/parser/eclipse/Parser/ParserStringItem.hpp>
@@ -40,7 +41,7 @@ BOOST_AUTO_TEST_CASE( parse_TITLE_OK ) {
     ParserPtr parser(new Parser());
     boost::filesystem::path fileWithTitleKeyword("testdata/integration_tests/TITLE/TITLE1.txt");
 
-    DeckPtr deck = parser->parseFile(fileWithTitleKeyword.string());
+    DeckPtr deck = parser->parseFile(fileWithTitleKeyword.string(), ParseMode());
 
     BOOST_CHECK_EQUAL(size_t(2), deck->size());
     BOOST_CHECK_EQUAL (true, deck->hasKeyword("TITLE"));