Added secnumdepth explicitly to the settings

See merge request !43

This is mainly to make it easier for the authors to find where and how
to change the setting.

Set maxcitenames to something reasonable

See merge request !41

Add suggestions for citation style and sorting=none as default

See merge request !42

Very many student theses at LiU e-press use the default settings for
citation style, thinking this is the only choice LaTeX gives them.

The problem is that the style is numeric [1] but sorted by author name
instead of by order of appearance.

This commit adds a default sorting=none which makes the sorting by
appearance and lists a few suggestions for citation styles.

Outputting 99 author names for a \citeauthor or \citetext command is
too much.

Enable PDF/A-2b to choose between RGB and CMYK

See merge request !40

Centered date and time on exhibit page, exposed some parameters to highlight need for parameterization

Another colorprofile textstring

See merge request !39

Add rudimentary PDF/A-2b support

See merge request !38

use xdg-open as the pdf viewer

See merge request !31

Don't typeset from \AtBeginDocument

See merge request !37

Clear double page after acknowledgements

See merge request !30