- Update jquery to 3.4.0

- provide URNs for jquery-ui

- bump fallback-version of bootstrap to 3.4.1 (used, when the bootstrap3 theme is not installed)

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file jquery-3.4.0.js was initially added on branch oacs-5-10.

file jquery-ui.min.js was initially added on branch oacs-5-10.

file jquery-ui.js was initially added on branch oacs-5-10.

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file jquery-ui.css was initially added on branch oacs-5-10.

file jquery-3.4.0.min.js was initially added on branch oacs-5-10.

- bump version number of bootstrap to 3.4.1

- use jquery 3.4.0

- use URN for jquery (one should probably create a own jquery package, although, jquery is losing it importance)

- make use of new "create_or_replace" feature of acs-subsite

added "create_or_replace" flag to subsite::new_subsite_theme

This feature is similar to the "create or replace" idiom for updating

SQL functions and eases the update of standard themes

added "pure" declarations

removed null test after dereferences, avoid potentail null dereferences in error cases

removed null test after dereferences

improve code safety and remove dead statement

get rid of warning of static checker, reduce number of returns before end of function

bump version number to 4.11.4

fix ckeditor name from 4->5

Merge branch 'master' of ssh://alice.wu-wien.ac.at/usr/local/src/git-repo/nsf

minor code cleanup

add asserts

Continued work in changelog and announcement (still WIP) [skip ci]

revert "-version" change since

- appending the version to the URL is a hack, not compatible with other versioning approaches

- it is not compatible with resource URNs,

- a more complex version managemnt is needed when dealing with

multiple versions in an installation.

fix memory leak on "hyper-volatile" objects. it seems, we have to set the _is_autonamed flag in advance of obj initialization

include themed versions of files in the "variants" display (just for the current theme)

fix for issue #3391

Whitespace changes

provide proper error messages in case invalid sorting criteria are passed to table widgets

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whitespace cleanup

new API method Table->column_names to query the defined columns of a table.

simplify logic

improve handling in error cases

improve input checking on dates (cal-item-new) and improve error messages

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