allow building against uninstalled guile; move some things to meta/

allow building against uninstalled guile; move some things to meta/

* README: Add more info about building against an uninstalled Guile.

* meta/: New directory. The proximate cause of its creation is that I
  want to be able to build external packages against uninstalled Guile,
  and to do that I need guile-tools in the PATH, but I don't want
  $top_builddir/libtool in the path. But it seems like a good
  reorganization, for things that are /about/ Guile: pkg-config files, m4
  files, guile-config... then we also include uninstalled info: the
  environment, the pre-inst-guile script, etc.

* meta/guile-1.8-uninstalled.pc.in: New pkg-config template. pkg-config
  prefers -uninstalled pkg-config files, if they are in its path.

* meta/Makefile.am:
* meta/ChangeLog-2008:
* meta/gdb-uninstalled-guile.in:
* meta/guile-1.8.pc.in:
* meta/guile-config.in:
* meta/guile.m4:
* meta/guile-tools.in: Moved to meta/.

* meta/guile.in: This is the new name of pre-inst-guile.in.

* meta/uninstalled-env.in: And this, pre-inst-guile-env.in.

* Makefile.am:
* am/guilec:
* am/pre-inst-guile:
* check-guile.in:
* configure.in:
* doc/ref/Makefile.am:
* gc-benchmarks/run-benchmark.scm:
* test-suite/standalone/Makefile.am:
* test-suite/standalone/README:
* testsuite/Makefile.am: Adapt to meta/ change.