Final changes to build process for prebuilt windows files, documenting user configuration options, enabling clsql-lib load paths and some installation manual edits

Large changeset to enable thread safety; more *auto-commit* removal; sql class-root fix; new transaction model; cleaned up defaults for *store-controller*

Promoted diff's provided by the community (Pierre and Gabor) as well as a checkpoint of ongoing work to get the 0.6.1 development tree on HEAD working again.

Missing files from prior checkins -- config.sexp for new build and ele-postgresql from backend cleanup (might even be missing 0.6.0 file)