Issue #1145700 by jbrown, mr.baileys, joachim: harden link display on dblogoverview screen in case the link might be dependent on user input with any contrib module

#107824 follow up by myself: ensure that the newly added updates are in the 6.x-extra group and not disguised as 5.x to 6.x updates

#107824 by Frando, heyrocker, Dave Reid, AlexisWilke, andypost: the dblog referer and the statistics url columns were not in line with how we store URLs elsewhere (like the dblog location column); could result in data loss due to length truncation

#188246 by deekayen, mfb et al.: some icon and class definitions were missing from dblog, causing notice level errors themselves

- Patch #228576 by sun: too ambiguous stylesheet in dblog.css when form_altering the watchdog table.

#197730 by keith.smith: standardize on a much more user friendly cron reference in help texts, explain its importance with more examples in INSTALL.txt

#200069 by keith.smith: new standard for 'more information' links in module help texts, as the handbook we referred to before was renamed

- Patch #150245 by webchick, bjaspan, ralf, Arancaytar et al: move the .schema files into .install files to prevent mistakes.

#154064 by pwolanin: get hook_help() up to speed to menu changes, allowing router path based lookups, and also full path argument lookup with a passed argument array

- Patch #146910 by dww: only allow enabling modules with the same Drupal core compatibility version.

#145737 by yhager, documentation cleaned up by myself: add support for RTL CSS overrides and default RTL CSS override files for modules
Note: properties, which are different in the RTL display are marked with /* LTR */ in default CSS files now,
so maintainers remember that changing them should also have an effect on RTL CSS files.

This should open the way for better RTL (right-to-left written) language (such as Arabic and Hebrew) support.