- new functions security::driver and ad_server_modules to simplify
  redundant logic for determining secure drivers
- use per-thread caching for security::driver and ad_server_modules
- brace while expressions
- don't use expr within while expression
- use numeric comparison for truth values
- normalize string expressions
- use numeric comparison for truth values
- normalize string expressions
- normalize string expressions
- avoid setting one-use variables for frequently called code
- fold multiple upvars to a single one
- make indentation more regular
- fix one case of double dollar
- brace expressions
- factor out groupby tests
- flatten nested lindex-structures
- use single "lassign" instead of multiple "lindex" operations
- flatten nested list structures
- flatten nested "lindex" structures
- use numeric comparison operator for truth value comparisons
- flatten nested "lindex" structures
- use "lassign" instead of multiple "lindex" operations
- flatten nested "lindex" structures
- flatten nested "lindex" structures
- merge multiple "lappend" operations
- use "lassign" instead of multiple "lindex" operations
- improve performance util_convert_line_breaks_to_html by reducing
   number of regsub operations and more precise regular expressions
- use numeric comparison operator for truth value comparisons
- use "lassign" instead of multiple "lindex" operations
- reduce number of remaining "string equal" operations
- flatten nested "lindex" structures
- use numeric comparison operator for truth value comparisons
- reduce number of remaining "string equal" operations
- reduce number of remaining "string equal" operations
- merge multiple "lappend" operations
- use namespace qualifier rather than "global" command
- fix reporting of errors from nested adp calls leading to
   "Error: rp_report_error: Error rendering error page (!)"
  Example http://openacs.org/shared/community-member?user_id=27685
- normalize string expressions
- normalize string expressions
- reduce number of remaining "string equal" operations