Functions folder sweep

- regroup DrawTab & WrapTabs functions in Tab.fnc.php file
- regroup PDFStart & PDFStop functions in PDF.fnc.php file
- regroup button function in Buttons.fnc.php file
- delete UpdatePullDown.fnc.php file
- move array_rwalk function to Modules.php file
- delete ShowVar.fnc.php file & replace with print_r in database.inc.php
Remove BackPrompt in AddAbsences.php
Minor changes
Remove BackPrompt in CreateParents.php
Remove BackPrompt in NotifyParents.php
Note instead of Error
Remove BackPrompt in AddActivity.php
Delete FDFReportCards.php

- works with mbtPdfAsm to generate PDF Report Cards...
Remove BackPrompt in FinalGrades.php
Remove BackPrompt in MassDrops.php
Remove BackPrompt in MassRequests.php
Remove BackPrompt in MassSchedule.php
Remove BackPrompt in AddAbsences.php (2)

- move errors right after DrawHeader