Remove some variability from exercise01

See merge request !28

Feature/cleanup exercise tutorial00

See merge request !27

Delete exercise/src directories for real

See merge request !26

Feature/cleanup exercise04

See merge request !25

Switch dune-pdelab-tutorials to using UseLatexMk.cmake

See merge request !24

For more detailed information, see the project repository
at https://github.com/dokempf/UseLatexMk

Remove non-existent tutorial

See merge request !23

The "tutorial06" is a dummy copy of tutorial00.
We should rather not ship anything...

Conflicts:
	tutorial06/doc/tutorial06.tex

Change foldername: exercise/src -> exercise/task

See merge request !21

Also adjust some names in files and broken links.

Fix inclusion of the ALU DGF header (which moved to dune-alugrid)

See merge request !20

Fix cmake latex issues when using current master

See merge request !18

Remove files to non-existing source files.

See merge request !19

While these might have there somewhen they do not exist in current master.

Fixes errors
"  DEFAULT_PDF option removed in version 2.0.  Use FORCE_PDF option or
  LATEX_DEFAULT_BUILD CMake variable instead."
and
"  MANGLE_TARGET_NAMES option removed in version 2.0.  All LaTeX targets use
  mangled names now.
"

in Ubuntu 16.04 LTS.

Fix typos



See merge request !17

that it is three steps of a one step theta scheme.