There are still references to pV3 in `parallel/ppif/MPI/ppif.cc`.

This was already optional.

The files `paraview.cc` and `paraview.h` are not referenced anywhere and
are in particular not built.

Remove `RCS_ID` and `RCSID`

Closes issue #5

See merge request !8

Remove remaining occurances of `RCSID`, except in historic references.

Most occurances of `RCSID` were removed with the following `sed` script:

```
  \!/\* Revision Control System!,\!RCSID! d;
  \!/^RCSID! d;
```

Remove remaining occurances of `RCS_ID` that were handled wrongly or not
at all by the previous commit.

Most occurances of `RCS_ID` were removed with the following `sed`
script:

```
  \!/\* \(data for CVS\|RCS string\)!,\!static char! d;
  \!/\* RCS_ID!,\!\*/! d;
```

.gitlab-ci.yml: Switch to CMake



See merge request !6

Feature/remove register and Dart binaries



See merge request !7

the documentation was recently removed

It's deprecated in C++17. According to H. Sutter,
you should "never write register. It's exactly
as meaningful as whitespace."

Remove all documentation related to testing using the 'Dart' system

These files are very much obsolete.  Dart testing has stopped more than
ten years ago.

See merge request !5

These files are very much obsolete.  Dart testing has stopped more than
ten years ago.

Remove ARCHNAME



See merge request !3

Set CMAKE_LIBRARY_ARCHITECTURE to unknown if it is not set.

Otherwise ARCHNAME in config.h will not be defined and compilation fail.
Closes #1 

See merge request !1

Feature/require bison and flex

Fixes #7

See merge request !2

Fixes #7

Otherwise ARCHNAME in config.h will not be defined and compilation fail.

For an installed UG these end up in the same directory.
Therefore we need to add all locations to the include
path to make uninstalled dune-uggrid module usable by
other modules.

Otherwise we overwrite stuff needed by DUNE for uninstalled packages.

In commit 97a432a5 the name of the
generated file was fixed in `ngin`, but the same problem is also
present in `ngin2d`.

This fixes the following compilation error:

  Building CXX object dom/lgm/ngin2d/CMakeFiles/ngin2.dir/ngin-lex.cc.o
  ngin-lex.ll:26:24: fatal error: ngin-yacc.hh: No such file or directory

In this case we need to make sure that all OBJECT libararies
are created with the target property POSITION_INDEPENDENT_CODE
set to true.

It should be ngin-yacc.c and not ngin-yac.cc to generate
the header that is assumed by the lex header.