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Take II, folks.

This commit fixes a link-time issue that comes about when an
incompatible system-level leveldb is already installed. The problem is
that leveldb isn't listed as a dependency, so link-time -lleveldbs
aren't preceded by -L{prefix to the leveldb I actually want}/lib, so
when a potentially incompatible system-level leveldb exists, then bad
things happen.

@brobey you might be interested in this.

Fix configure

See merge request !2

should properly get pkg-config exporting boost libraries when not
installed in default locations (e.g. via spack)

also required un-ignoring the m4 directory, but we'll still ignore the
libtool-contributed files ('prepare' copies them in for us)

- fixes #17

adapted to new provider-id API

See merge request !1