Merge from trunk
Update .net magazine
Make the darkness of the current cell highlight settable from python
Handle dark colorschemes when highlighting current cell
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Mark Nook UK store as affiliate.
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Search and replace wizard: Fix generated html being slightly different from the actual html in the conversion pipeline for some input formats (mainly HTML, CHM, LIT).
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MOBI Input: Add support for MOBI/KF8 files generated with the to be released kindlegen 2.9. Fixes #1179144 (error during conversion azw3 to other formats)
MOBI Output: Fix space errorneously being removed when the input document contains a tag with leading space and sub-tags. Fixes #1179216 (Space lost between span tags converting to mobi)