remove all trailing white space

this is just the result of

```
find -iname "*.[ch]pp" | xargs sed -i "s/ *$//"
find opm/parser/share/keywords -type f |  xargs sed -i "s/ *$//"
```

so if it causes conflicts with other patches, the others should get
priority. The rationale behind this patch is that some people tell
their editor to remove white space which leads to larger than
necessary patches...

opm/parser/eclipse/Deck/Deck.cpp

@@ -31,11 +31,11 @@ namespace Opm {
     bool Deck::hasKeyword(const std::string& keyword) const {
         return m_keywords->hasKeyword(keyword);
     }
-    
+
     void Deck::addKeyword( DeckKeywordPtr keyword) {
         m_keywords->addKeyword(keyword);
     }
-    
+
     DeckKeywordPtr Deck::getKeyword(const std::string& keyword, size_t index) const {
         return m_keywords->getKeyword(keyword , index);
     }
@@ -43,11 +43,11 @@ namespace Opm {
     DeckKeywordPtr Deck::getKeyword(const std::string& keyword) const {
         return m_keywords->getKeyword(keyword);
     }
-    
+
     DeckKeywordPtr Deck::getKeyword(size_t index) const {
         return m_keywords->getKeyword(index);
     }
-      
+
     size_t Deck::numKeywords(const std::string& keyword) const {
         return m_keywords->numKeywords( keyword );
     }
@@ -71,7 +71,7 @@ namespace Opm {
     std::shared_ptr<UnitSystem> Deck::getActiveUnitSystem() const {
         return m_activeUnits;
     }
-    
+
 
     std::shared_ptr<UnitSystem> Deck::getDefaultUnitSystem() const {
         return m_defaultUnits;