Feature 5425 / thumbnail: rewrite - secure thumbnails are now rendered on first access, not when 'AS _thumbnail' is called.

Feature 5425 / thumbnail: rewrite - secure thumbnails are now rendered on first access, not when 'AS _thumbnail' is called.

Manual.rst - Doku angepasst
Download.php - Mime type wird nicht mehr an Dateiname angehängt

DatabaseUpdateData.php: extend FormElement.type to 'imageCut'.
Support.php: extend joinPath() to join path parts optionally without using file as absolute path. Implement unit tests.
Download.php: doc
AbstractBuildForm.php: implement FE,typ=imageCut
formEditor.sql: update FE with new element imageCut.

Download.php, Html2Pdf.php, Link.php, SendMail.php: Add TOKEN_PAGE as a valid source for download. This should be the same as TOKEN_URL_PARAM.

Sendmail.php: Remove the optin '-q'  (quiet) from 'sendEmail' to see problems with broken parameter. Fix problem with missing '-a' for first attachment. Escape all Shell arguments before calling 'sendEmail'. Recode attachmentsBuild().

Manual.rst: sendMailToken 'f' changed from  'f' to 'F'.
Download.php, Linnk.php: TOKEN_FILE_DEPRECATED
Sendmail.php: broken, in the middle of work

Specify content disposition header filename in '"'. Remove none alnum chars from filename.
Sanitize.php: update doc
Download.php: Implement filename to be enclosed by ". Sanatize filename.
SanitizeTest.php: unittest for safeFilename().

Manual.rst, AbstractException.php, SessionCookie.php, Downoad.php, Error.php, Link.php, Report.php, Store.php, AbstractBuildForm.php, BuildFormBootstrap.php, config.qfq.example.ini: replace all access to SHOW_DEBUG_INFO with respect to multiple values.

Implement additional 'SHOW_DEBUG_INFO = download' to track down problems with 'session forwarding'.
Configure constants for SHOW_DEBUG_INFO for yes|no|auto

Fix from BB seems to help in 90%: window.onblur().
QuickFormQuery.php: Add 'windows.onblur'

Handling of filenames in Zip's optimized. Spoken filename (no cryptic tempnames anymore). Correct filename extension, based on the mimetype.

Manual.rst: updated doc for columns  _pPdf,_zZip, _fFile. Remove doc for '_dDownload'.
Download.php: new function targetFilenameExtension(). Replace cryptic temporary filenames against file-1, ...
Link.php: reorder param array, to make TOKEN_DOWNLOAD position independet
Report.php: Implemented _pPdf,_zZip, _fFile.

Link.php: If there is no output filename defined, the default is now computed in Download.php, not in Link.php as before.
Download.php: Extract filename extension from mimetype, compare it with output filename, if it does not match, append the computed extension. This forces the filemanager to open the correct application after download.

* Recode the '_link' notation for download
* Add 'ZIP' as export format
* Add 'parameter' to wkhtmltopdf
* Implemented 'SYSTEM_STORE / SYSTEM_DOWNLOAD_POPUP' for detecting if there are download links on the page. This eleminates passing parameters through dozens of functions.
* Report/Columntype '_dDownload' broken!
Coding.md: described `download` from a coding point of view.
Manual.rst: Update '_link' to latest notation of 'download'.
download.php: implemented catching of 'Undefined index'. Added further exceptions.
Download.php: Added cache=off for downloading. Rename getFile() to getElement(). Make getElement() more generic. Add zipFiles(). Implement 'downloadMode' in doElements().
Html2Pdf.php: recode to new download notation. Parameter to wkhtmltopdf implemented.
Link.php: New TOKEN_* and NAME_DOWNLOAD_*, NAME_FILE. Move TOKEN_* to Constants.php. Will be used in Download.php too. Implemented 'SYSTEM_STORE / SYSTEM_DOWNLOAD_POPUP'. Implemented BASE64 encoding of multiple 'U' and 'u'.
Report.php: Implemented 'SYSTEM_STORE / SYSTEM_DOWNLOAD_POPUP'.
Sip.php: implement debugSip() to show Sip. New: base64 encoded parameter will be shown in clear.
Store.php: some functions missed keyword 'static'. getVar() and getStore automatically decode base64 parameter.
QuickFormQuery.php: Implemented 'SYSTEM_STORE / SYSTEM_DOWNLOAD_POPUP'.

Implemented download.php to offer SIP protected downloads for single files (any filetype) as well as concatenated PDF files and converted HTML pages.
download.php: API Interface
DownloadException.php: New exception class for downloads - might be extended for better error handling.
OnArray.php: new function getArrayItemKeyNameStartWith() to filter for specific elements in an array. New function arrayEscapeshellarg() to escape args
Download.php: Main class.
Link.php, Report.php: implemented new link type 'd' (=download)