Support for ets:delete_object/2

This solves one more problem mentioned in the discussion of issue #33.
Support for error_logger:warning_map/0
Tips for complex test and many errors

Closes Issue #34.
Tip about communicating with standard_error and user for output

Closes Issue #35.
No dependency between untrapped normal exit signals and messages
Add a disabled and unproven optimisation
Fix insert_new and delete_object dependencies
Support instrumentation of preloaded modules for >= 17.1

Fixes #37.
Merge pull request #38 from aronisstav/preloaded-fix

Support instrumentation of preloaded modules for >= 17.1