Issue #[1895882] by hles: All links are hidden if the hide_term option isn't set, bug introduced by commit 429b67db, a test was added.

taxonomy_menu_menu_link_prepare is now much more readable as it uses a new function to load or initialize a menu item (taxonomy_menu_menu_link_load)

Added a helper module for tests that registers paths that could be used in Taxonomy Menu but are not in a default Drupal installation.

- Fixed buggy behavior of nodes count
- Adjusted Hide empty term test to reflect these changes
- Improved description of admin options

Added #states to HTML title attribute option for better admin experience and commented vocabulary description option because it's not used atm

- Introduced a helper function to check a path exists in {menu_router}

Added a hook so other modules and submodules can add their own settings to the taxonomy vocabulary form and be processed altogether. Changed options word in settings.

Prevent notification message saying that the taxonomy menu was not updated when a full rebuild has been selected, even if the options have not changed.

Added a test for 'display empty terms' option and fixed wrong behavior of the function detecting nodes attached to a term.

Changed DISABLED by NONE in menu location's option. DISABLED suggests that the taxonomy menu is still there but disabled, when in fact it is completely removed.

Introduced 2 functions taxonomy_menu_variable_get and taxonomy_menu_variable_set that abstract _taxonomy_menu_build_variable and allow for better code readibility

Reworked the administrative settings. In particular, Taxonomy Menu can now detect changes between saved and submitted settings, which allow not to process taxonomy terms when unneeded. Added a functional test to reflect that. Hook to add settings to Taxonomy Menu was removed.

Major rewrite of the functions processing terms in order to create their menu links' equivalent (batch functions, save/update menu links, preparation of a taxonomy term to be saved as a menu link). Probably breaks a few things for now, but passes all the current tests.

Adds tests for configuration (show expanded, display term's description, display flat menu) and other small improvements.

Issue [#1726718] by Barrett, idflood: Replace require_once() by module_load_include() in taxonomy_menu.module