2010-1-24
    1.8.1: uses updated exception handling of hsql-1.8.1; refactorings
2009-2-15
    1.7.3: filtering out of zombie dir paths returned
               `pg_config --includedir-server',
	   (headers are usually in the top include directory then)
	   to prevent unnecessary error exit. 
2009-2-13
    1.7.2: constrained requirement of `base' by `>=4.0.0.0' to stop cabal-install
           from assuming base-3.?.?.? 