Save dist file sizes for bandwidth calculation

Also fix a typo in copying dist files to tdir and backup.
Add notes on provisioning a file hosting server
ToC Editor: Use filenames when generating from files

ToC Editor: When generating a ToC from files, if the file has no text,
do not skip it. Instead create an entry using the filename of the file.
Log the wait before sending email

When waiting before sending email, log the wait. Fixes #1195173 [Feature Request - Multiple books emailed to device](https://bugs.launchpad.net/calibre/+bug/1195173)
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pep8
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pep8
ebook-convert: Add option to read metadata from OPF
version 0.9.37
Various minor fixes in the publish process
pep8 and small perf improvement for human_readable()
Source and Series into dir name
Merge branch 'gshome' of https://github.com/hakan42/calibre into gshome