Preprocessor update

– Fix indexing in M_.endo_trends (Ref. #1648)
– Macro processor: fix tracking of line numbers after @#define, @#include and
  @#includepath directives
– Macro processor: fix error message when @#include is used with nonexistent file

preprocessor @ 03015955

-Subproject commit 6093eaba9f17ba331482864d2d7908dee68f8e8f
+Subproject commit 0301595516cf9be594123c8f15e89a9a2363174d