#422116 by JohnAlbin: Kill off theme_engine_name prefix for theme functions to assist with theme inheritance and TX (Themer eXperience).

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.

#166071 by jjeff and dvessel: move default template preprocess code to template_preprocess, and add *lots* of documentation to template files and functions

- Patch #141730 by Earl: allow theming system to use wildcards.  I promised in the issue that this patch would still go in, so here goes.

- Patch #137211 by merlinofchaos: move theme information to .info files and improved theme inheritance.

#105726 by moshe weitzman. Remove necessity to hard-code theme engine directories since they can change.

- Patch #88287 by asimmonds, dww et al: installer doesn't support modules outside root/modules directory.  Critical bugfix.

- Patch #77919 by chx, eaton, moshe, et al: enable programmaticaly submitted forms via the pull model.