Code Freeze means that no code changes except rather small bug fixes and work arounds are acceptable.

Wanted:
 * local, few line, obvious fixes of reproduceable bugs
 * typical patch size of about 1-2KB

Unwanted:
 * refactoring, reformatting of code
 * renaming of modules, classes, functions
 * adding new files, classes, functions
 * bug fixing by:
  * major rewrites of functions
  * API changes
  * widespread changes
 * big changes for bugs that are considered rare and uncritical
 * implementing feature requests reported as bugs (bug == failing code - if we have no code for it, it is a feature request, not a bug)