Use by default receipts of length 16 numbers.
Implement download of files via POST based FORM
Add support for disabling receivers that don't support encryption if encryption_only is set.
Display a warning message that the tip files are unencrypted.

Allow the admin to disable encrypted only node from wizard.
Make the string describing the encryption policy more accurate.
added informative message in case of receiver file in nokey status
refactored wizard
appdata refactoring
added missing appdata*.json to repo
readded redirect if wizard not done
resized textareas of wizard
fixed fields preview incorrect visualization
reflected backend change of receipt_regexp
fixed GLCrypto create password to be sure number+letter happens
improved unit testing adding tests for /admin/node GET/PUT and fixed all tests against allow_unencrypted
various text fixes
corrected some strings tanks to translator suggestions
added preview of the receipt output
updated content in Admin landing page
various fixes to landing page