Use spaces instead of endOfLine

Thanks @cmaeder for the suggestion. Using `spaces` has two benefits.
It gets rid of a dependency issue resulting in a compilation error and
it allows me to be consistent and only eat up whitespace at the end of
lines.

Common/AnnoParser.hs

@@ -27,7 +27,6 @@ module Common.AnnoParser
     , newlineOrEof
     ) where
 
-import Text.Parsec.Char (endOfLine)
 import Text.ParserCombinators.Parsec
 import Text.ParserCombinators.Parsec.Error
 import Text.ParserCombinators.Parsec.Pos as Pos
@@ -238,8 +237,7 @@ floatingAnno ps = literal2idsAnno ps Float_anno
 
 prefixAnno :: Range -> GenParser Char st Annotation
 prefixAnno ps = do
-    prefixes <- many $ skipMany (commentLine >> endOfLine) >> do
-        spaces
+    prefixes <- many $ skipMany (commentLine >> spaces) >> do
         p <- (string colonS >> return "") <|>
              (IRI.ncname << string colonS)
         spaces