0024784: Move documentation in CDL files to proper location

Mostly duplicated comments were removed and missing ones were moved
into dedicated class CDL files.
Some more duplicated comments were removed from CDL files.
Correction of merge

src/IntTools/IntTools_LineConstructor.cdl

@@ -17,6 +17,8 @@
 class LineConstructor from IntTools
 
         ---Purpose: Splits given Line.
+        --          Class provides post-processing of results of
+        --          surfaces intersection
 
 uses Line           from IntPatch,
      TopolTool      from Adaptor3d,