Ebookmaker

- fixed a problem with covers selected from linked images based on the file name. (The image file would be added twice).
- fixed a problem with linked images being omitted if they also were used as the cover image
- cover images are stripped from the flow because they are re-added to the flow in the coverpages. This behavior can now be over-ridden with the x-ebookmaker-important class (as has been advertised).
- added `--config-dir` command line argument to help guiguts integrate the included tidy config file.
- update docutils to 0.18+
- fixed a problem with noimages files with caused by the parsing for .images jobs. Build order reversed!
- fixed a problem with noimages files due to broken link removal
- changed file naming methods so that Calibre file checking no longer complains.
- 0.11.25 was not deployed due to test failures.

- compatibility with docutils 0.18+. docutils' node traversal was changed from a list to an iterator.
- fixed duplicated generated cover bug. This caused errors in epubs generated by Online Ebookmaker or when the source directory is the same as the target directory.
- fix entities in generated CSS. When we generate HTML from txt or rst we must not entify '>'
- fix problem when an html source file links to a text file. Ebookmaker was trying to convert these files to html, and including them in the ebook reading order. Now, linked plain text files are only converted to utf8, nothing more.
- make sure that every img element has an alt attribute
- replace obsolete attributes for HTML5: tdbackground, tdbordercolor, trbordercolor, tablebordercolor, tableheight, tablebackground background (the last one was never a thing!)
- remove blink elements
- add missing dd elements
- make sure that lang attribute == xml:lang attributes, everywhere.
- fix issue with <CR> in metadata when setting title for conversion from text files
- update to libgutenberg 0.8.12 to fix issue with control characters in dc.title meta tags

- moves tfoot to end of tables for HTML5
- removes superfluous span attributes in tables for HTML5
- replaces frame and rules attributes in tables with equivalent css for HTML5
- checks all values of the lang and xml:lang attributes for validity, fixes common invalid values for HTML5
- fix theadalign, tfootalign, theadvalign, tfootvalign for HTML5

- fixed file scanner to not scan parent directory when asked to scan a directory

- fixed file scanner used to find covers

- tt elements replaced by span with monospace font in HTML5
- newlines properly escaped in meta attributes
- removes meta elements with scheme attribute
- fixed missing coverpages in epub