set-pers-flags

Modified RPC calls
        create-person (new parameter pers-flags)

Removed several hard-coded constants and paths.
        Max texts
        Max conferences
        Nologin file

Support for aux-item validation functions (not just regexps.)
Support for aux-items that can only be created by the server
Support for linking pairs of aux items

Added test cases to improve code coverage

Renamed log to kom_log to avoid conflicts with math function log.

Several bug fixes (code and documentation)