Intermediate commit for MySQL and MariaDB, still under debugging
Intermediate commit with MariaDB adaptations, but still not stable
Intermediate commit for issue #20, ok for MySQL, not ok for MariaDB
function lixa_my_retrieve_subtype() completed
test commit from ubuntu 16.04
intermediate commit
Changes for issues #24, #25, #26
Small changes related to issue #18, issue #22, and issue #23