r6: Various fixes from HEAD
r6: Various fixes from HEAD

- Documentation and style corrections
- Don't write user passwords into the log file
- Assign copyright to Quest; reformat licence text
- Turn VAS errnos into readable text
- Allocate username storage from apache(1.3)'s connection pool
- Improve debug info to distinguish between gss_accept_sec_ctx failing, or
  just expecting more tokens.
- Move GSS context state from the connection record into the request record
- Improve SUEXEC #warning text
- Define APXS1 to 1 instead of the empty string so that #if works

dell-oss/mod_auth_vas,dell-oss/mod_auth_vas