`make install' now works.
Connected the `doc' subtree to global makefiles.
All documentation is built in obj/doc (resp. doc/ if you do a stand-alone build).
Use `make docs' to make the whole documentation or `make userdocs' resp.`make progdocs' for user manual resp. developer's guide.
Added missing quotes.
Added new target "tags" to generate a tag table for Emacs.
Also made "depend" work before the tree is compiled first time.
First few FreeBSD portability fixes.
Propagate "depend" target to real top-level Makefile.
New makefiles. Includes support for out-of-source-tree builds.