fully support relocatable binaries, improving AppImages

* You can now specify `--with-scitecodatadir` as a relative path,
  that will be interpreted relative to the binary's location.
* Win32 binaries already were relocatable, but this was a Windows-specific
  hack. Win32 binaries are now built with `--with-scitecodatadir=.`
  since everything is in a single directory.
* Ubuntu packages are now also built `--with-scitecodatadir=../share/sciteco`.
  This is not crucial for ordinary installations, but is meant for AppImage creation.
* Since AppImages are now built from relocatable packages,
  we no longer need the unionfs-workaround from pkg2appimage.
  This should fix the strange root contents when autocompleting in
  AppImage builds.
* This might also fix the appimage.github.io CI issues.
  I assume that because I could reproduce the issue on FreeBSD's
  Linuxulator in dependence of pkg2appimage's "union"-setting.
  See https://github.com/AppImage/appimage.github.io/pull/3402
* Determining the binary location actually turned out be hard and
  very platform-dependant. There are now implementations for Windows
  (which could also read argv[0]), Linux and generic UNIX (which
  works on FreeBSD, but I am not sure about the others).
  I believe this could also be useful on Mac OS to create app bundles,
  but this needs to be tested - currently the Mac OS binaries are
  installed into fixed locations and don't use relocation.

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