Add note about binary files in patchsets
Add note about AUTHORS in open source projects
Note about test writing
Note about bisect
Fix 'use pk-git-... instead of pk-git-...'
lua-guidelines.md: note about naming of files with tests
lua-guidelines.md: add ipairs to list of deprecated functions

ipairs also noted in section about loops, but also should be listed here,
all prohibited and deprecated functions should be listed in one place.