* depdemo: moved each library into a subdirectory

* depdemo: moved each library into a subdirectory
  to test hardcoding
* ltconfig.in: added hardcode_into_libs (whether library paths
  should be hardcoded into the libraries instead of the program),
  shlibpath_overrides_runpath, must_relink
* ltmain.in: renamed link-install mode to relink,
  save the command line arguments properly, simplified hardcoding,
  use relative/absolute paths where appropriate,
  take care of shlibpath_overrides_runpath,
  relinking works now (for programs as well as for libraries)
  hardcode all (even dependency_libs) library paths into a program,
  don't add shlibpath/runpath to compile_command,
  thousands of bugfixes...
* inter-library dependencies are now _fully_ functional !