Fix small problems found by cppcheck
Add functions to read ZID cache entries, raw data, formatted as string

an application may use these functions to implement some UI to show all ZID
cache entries to the user.
Merge branch 'ziddump' into develop
Free buffer with operator delete []
Change names of SHA2 functions to avoid name clashes
Order full ZID list by secure-since date
Fix function definition or ZID read, fix compiler warning
Smalle update to ignore helper subdir
Prepare V4.2.0
Merge branch 'develop'