#1255: Remove whole 'Log', 'Utils', 'Db' class - completely useless and not used much. As side effect, #1255, has been solved.
report/Db.php|Log.php|Utils.php: deleted - not necessary anymore
Link.php, Report.php: Remove references to deleted classes. Adjusted one call to db->sql().

formEditor.sql: Added ':S0' to make FormEditor more robust - no error message in case formId can't be resolved, but still wrong behaviour.
Constants.php: Prepend '_' to SIP_MAKE_URLPARAM_UNIQ
Evaluate.php: phpstorm shows that 'getDebug()' is not used anywhere - commented.

delete.php, Delete.php: reformat
Link.php: typo

CODING.md: update docs for situation 'new record already saved'.
FillStoreForm.php: In case of form load with r=0, the submitted form element names are does not contain the effective record id - workaround implemented.
Session.php: refactored clear(), create unsetItem().
Sip.php: new buildParamStringFromArray(), updateSipToSession().
Store.php: For r=0 SIPs always add a uniqe parameter.
AbstractBuildForm.php: modified message for subrecords on new record.
QuickFormQuery.php: create unique SIP on form load.

Sip.php, Constants.php: define constant

Delete.php: fixed typo.

.gitignore: added qfq*.zip to ignore. The '*' is important in case the extension are generated with the version number included in the filename.

UsersManual/Index.rst: fixed some typos, replace sanatize class enumeration against table.

Makefile: `make archive` now generates again an extention which can be installed in T3 6.2 and 7.6. The problem was that the zip filename has to be equal to the extension name.