in the replacement of internal nocache-tags to dynamic content that
lead to false results with deeply nested includes or with
nocache-blocks inside nocache-blocks.
many thanks to Lars Jankowfsky for providing big help on reproducing
and tracking down this bug!
templates)
- reuse cache_serials if a file is compiled more than once in one
process (force_compile)
- don't print nocache-delimiters wenn already inside
process_cached_inserts()