Replace PCL with LibXISF

imageinfo.h

@@ -6,7 +6,7 @@
 #include <cmath>
 #include <memory>
 
-namespace pcl { class FITSHeaderKeyword; class Property; }
+namespace LibXISF { struct FITSKeyword; struct Property; }
 
 struct FITSRecord
 {
@@ -14,10 +14,9 @@ struct FITSRecord
     QVariant value;
     QByteArray comment;
     bool editable() const;
-    FITSRecord(){}
     FITSRecord(const QByteArray &key, const QVariant &value, const QByteArray &comment);
-    FITSRecord(const pcl::FITSHeaderKeyword &record);
-    FITSRecord(const pcl::Property &property);
+    FITSRecord(const LibXISF::FITSKeyword &record);
+    FITSRecord(const LibXISF::Property &property);
     QByteArray valueToByteArray() const;
 };