BlenderDNA.h:

* Fix rethrow that would crash the program.
* QUESTION: am I throwing the right exception here.

COBLoader:
* catch exception by const ref
* fix equality checks using strncmp taht weren't actually checking equality

FBXMaterial: Catch exception by const ref (+ Debug log that it's done so)

FBXConverter: Rename local variables to avoid shadowing parameter

ImageExtractor: Remove duplicated/unreachable code

FBXConverter: Another shadowed variable fix

MD5Loader: 2 shadowed variables

IRRLoader: shadowed parameter

StepFileReader.cpp: Shadowed parameter

IRRLoader: remove empty else statement

STLExporter: Throw error instead of silently ignoring unimplemented option

Misc empty blocks removed or debug logging added

code/Importer/STEPParser/STEPFileReader.cpp

@@ -278,10 +278,10 @@ void STEP::ReadFile(DB& db,const EXPRESS::ConversionSchema& scheme,
         std::transform( type.begin(), type.end(), type.begin(), &Assimp::ToLower<char>  );
         const char* sz = scheme.GetStaticStringForToken(type);
         if(sz) {
-            const std::string::size_type len = n2-n1+1;
-            char* const copysz = new char[len+1];
+            const std::string::size_type szLen = n2-n1+1;
+            char* const copysz = new char[szLen+1];
             std::copy(s.c_str()+n1,s.c_str()+n2+1,copysz);
-            copysz[len] = '\0';
+            copysz[szLen] = '\0';
             db.InternInsert(new LazyObject(db,id,line,sz,copysz));
         }
         if(!has_next) {