Manual.rst: update documentation after refactor 'extension/qfq/qfq/...' to...

Manual.rst: update documentation after refactor 'extension/qfq/qfq/...' to 'extension/Source/core/...'. Fixed outdated mail.log statement.
1 job for master in 1 minute and 38 seconds (queued for 15 seconds)
Name Stage Failure
snapshot Test There is an unknown failure, please try again
Build finished. The HTML pages are in build/html.
make[1]: Leaving directory '/home/gitlab-runner/builds/7e3e234d/0/typo3/qfq/extension/Documentation/_make'
rm -rf dist/
mkdir dist
cd extension ; cp -R Classes Configuration Documentation qfq Resources ext_emconf.php ext_localconf.php ext_tables.php ext_icon.png ext_conf_template.txt config.qfq.example.php RELEASE.txt ../dist/
cp: cannot stat 'qfq': No such file or directory
Makefile:54: recipe for target 'dist-copy-extension' failed
make: *** [dist-copy-extension] Error 1
ERROR: Job failed: exit status 1