Link.php: added parameter to JS alert code

OnArray.php: new explodeWithoutEscaped()
Link.php: new doQuestion()
Report.php: Link class will be initialized during __construct().

Unittests fuer _page und _Page.
Link.php: add checkEmptyValue(), checkValue() - code becomes cleaner.
Report.php: diverse Stellen empty() entfernt und durch isset() && ==='' ersetzt. empty() nimmt auch '0' als leeren Wert.

Link.php: fixed bug that '0' as parameter for a token was equal to 'take default'.
Report.php: fixed two bugs with 'uninitialized variable'
Sip.php: index.php replaced by a constant.

FillStoreForm.php, AbstractBuilForm.php, Support.php: replaced 'dateFormat' with 'FE_DATE_FORMAT' where appropriate.
AbstractBuilForm.php: buildDateJQW in a first version.

FillStoreForm.php, AbstractBuilForm.php: rena,ed buildFormElementId() to buildFormElementName(), deleted: builddateJQW(), copied buildDateTime() to buildDateJQW - but not coded.

Link.php: code refactored. New implementation should be position independent for the token string. Also some logic changed to be much cleaner. New: NAME_QUESTION_* (not implemented now), FINAL_*, $tokenMapping[], $tokenGiven[]. Removed: varsDefault - directly set in initVars().

PHP Unit Tests: LinktTest.php, ReportTest.phh - more tests

ReportTest.php: Link, render mode, mailto

Report.php: replaced hard coded 'report' token against constants. Initialize all tokens per level. Initialize class to be reentrant. usort: dirty style - disabled E_NOTICE for a short moment.

BuildFormPlainTest.php: fixed issue with double declared class FakeTSFE.
ReportTest.php: initially created.

Report.php: set default value for $t3data["uid"]. $bodyText now given to process() instead of the constructor - makes testing easier.
QuickFormQuery.php: applied change of 'bodytext' from Report.php.

Report.php: changed various comparison from '==' to '==='. Use of Support::doAttribute() instead of manual concatenating. Use of empty() instead of ==''.

UsersManual/index.rst: cleanup of _link, _pagex, _PageX description.
Link.php, Report.php: Hard coded token names replaced by constants. Name of token 'h' (HASH) changed to 's' (SIP).
Report.php: Removed code for column '_F'.