Fix $replace parameter handling in get_config()

Code was reached only on first function call, then short-circuited because of the reference cache.
Ensure get_config() optional argument is an array, remove useless test
Allow items to be set even if they were not present yet
Adjustments in static reference handling
Merge pull request #2609 from vlakoff/develop-2

Fix $replace parameter handling in get_config()
Kill the damn kitten
Lower precision for the CI_Benchmark::elapsed_time() test - there's no way to reliably test it
Made "Release Information" more readable.

The first time I read that paragraph it made no sense. The addition of a hyphen makes it easier to read at a glance.
Better transliteration for Russian and Ukrainian languages
Merge pull request #2614 from noskov/develop

Better transliteration for Russian and Ukrainian languages
[ci skip] Fix a documentation error
Add changelog entry for #2609
Merge pull request #2612 from vlakoff/documentation

Add changelog entries for #2609
Code cleanup in db->order_by()
Adjust a few phpdoc in query builder code
Merge pull request #2626 from vlakoff/develop-2

Code cleanup in db->order_by()
Merge pull request #2627 from vlakoff/develop-3

Adjust a few phpdoc in query builder code
fixed error in finding closing tag
Removed unnecessary parameter
Improved detecting whether the pointer is in a string or not