MDL-22546 removing dirroot from the config.php - this should finally solve the symbolic links issues because we know 100% what should be in $CFG->dirroot once we get into lib/setup.php, it is being initialised there automatically instead + more robust handling of dataroot + simplified config-dist.php and installer; the $CFG->admin is now visible only if admin directory can not be found; please note the old config.php's are still going to work, if admins remove the dirroot they have to add the __FILE__ into require_once lib/setup.php at the end of old config

Most of the calls has been fixed by the previous commit as item weight
is in fact just an interpretation of aggregation coefficient value.

AMOS BEGIN
 HLP grade/aggregationcoefweight.html,[aggregationcoefweight_help,core_grades]
AMOS END

String aggregationcoefextraweight is used when editing an item which is
aggregated by Mean of grades (with extra credit) and was reworded to
Extra credit weight (because in fact it is the weight of the extra
credit - if it equals zero, the grade is not extra)

String aggregationcoefextrasum is used for Sum of grades and Simple
weighted mean of grades, meaning a checkbox extra credit yes/no

String aggregationcoefextra is used in the header of table Categories
and items (either Simple view or Full view). It must contain the information
about both meanings of aggregation.

AMOS BEGIN
 HLP grade/aggregationcoefcombo.html,[aggregationcoefextra_help,core_grades]
 HLP grade/aggregationcoefextra.html,[aggregationcoefextraweight_help,core_grades]
 HLP grade/aggregationcoefextrasum.html,[aggregationcoefextrasum_help,core_grades]
AMOS END

AMOS BEGIN
 HLP grade/aggregatesubcats.html,[aggregatesubcats_help,core_grades]
AMOS END

AMOS BEGIN
 HLP grade/aggregateoutcomes.html,[aggregateoutcomes_help,core_grades]
AMOS END

accesslib MDL-22527 (undoing file accidentally committed with previous change - grr eclipse - sorry)

Finishing some todos and fixing some bugs

navigation MDL-20276 Fixed up the navigation for the quiz module and question section as per Tim's recommendation.
* Routine navigation through the quiz and question modules
* Fixed navbar through quiz and questions
* Pages headers added throughout
* Added method to turn a navigation node into a tabs array suitable for use with print tabs

MDL-20296 modifications necessary for improving grading for numerical and transform display.html as independent from
shortanswer, add display of unitpenalty for numerical in print_question_grading_details()

MDL-20296 improving grading for numerical and transform display.html as independent of the analoguous shortanswer file

MDL-20296 improving grading for numerical and transform diplay.html as independent of the analoguous shortanswer file

MDL-20296 creating common functions to handle units in numerical, calculated and calculatedsimple edit forms
and improving grading and rendering