Previously, the build system was an experiment in compartmentalizing
various autoconf and automake features. That was very much an experiment
I'm happy to put behind us. Managing it was just getting too abstract.

This moves us to a more traditional autotools setup using recursive
automake. I know, I know, "Recursive Automake Considered Harmful" and
all. Build times don't seem to be too adversely affected at the moment.

Also, we generate ide-debug.h now so that when --enable-tracing is set,
we force rebuilding the dependent modules.

  --enable-tracing now implies --enable-debug

I've also added two more options:

  --enable-optimizations will use -Bsymbolic for libide to help reduce
   the number of inter-PLT jumps.

  --enable-lto can be used to enable optimizations across .o's when
    linking.

I've also moved various things around in a more traditional layout.

  libsearch.la can be found in contrib/search. This contains the Trie
  and Fuzzy search indexes.

  libeditor...