Massive spec cleanup/rework preparing for merge review:
    - split apidocs to separate package (they're huge)
    - use system macros for bindir etc instead of defining our own
    - remove NPTL-related LD_ASSUME_KERNEL stuff, no longer functional anyway
    - remove various hacks that are no longer needed
    - ensure correct permissions of debug sources
    - follow fedora guidelines for user/group manipulation
    - clean up any non-matching bdb environment on post, not just 4.3
    - visual cleanup of spec