fix parsing of relative branch paths

src/branch.cpp

@@ -119,7 +119,9 @@ namespace l
   {
     uint64_t offset;
 
-    offset = s_.find_first_of('/');
+    offset = s_.find_first_not_of("+<>-=");
+    if(offset > 1)
+      offset = 2;
     *instr_ = s_.substr(0,offset);
     if(offset != std::string::npos)
       *values_ = s_.substr(offset);