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/ParsePLYSHLOG.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/EclipseState/EclipseState.hpp>
 
 using namespace Opm;
@@ -34,7 +35,7 @@ using namespace Opm;
 BOOST_AUTO_TEST_CASE( PARSE_PLYSHLOG_OK) {
     ParserPtr parser(new Parser());
     boost::filesystem::path deckFile("testdata/integration_tests/POLYMER/plyshlog.data");
-    DeckPtr deck =  parser->parseFile(deckFile.string());
+    DeckPtr deck =  parser->parseFile(deckFile.string(), ParseMode());
     DeckKeywordConstPtr kw = deck->getKeyword("PLYSHLOG");
     DeckRecordConstPtr rec1 = kw->getRecord(0); // reference conditions