add tabstop to vim modeline
bugfix: keep old page filename in the page's title link to itself

pass proper filename through parse_file to create_html_page

Bug was that when editing with "bb edit page.html" and changing title,
regenerated page.html had <h3><a class="ablack"> linking to newtitle.html
(non-existing file)
delete generated HTML file before generating new one, not at the bottom

Bug was that when confirming "[E]dit again" by providing an empty string,
the file wasn't deleted

we could as well do
if [ "$post_status" != "p" ] && [ "$post_status" != "P" ]
but this way is IMO cleaner
use expr to clean tags RegExp way
Clean up tag links only in "Tags:" line

The bug was that if you decide, for some reason, insert links to tag pages
into text of your article, then after editing this article, the links were
gone. That happened because "tag links cleaning" was too agressive (it was
cleaning tags not only on tag line, but in the whole text)
preserve backslashes when posting/editing

ask "read" not to process backslash sequences when reading user-edited file
and leave them as is, instead
Merge pull request #37 from Lex-2008/small-fixes/2

Small fixes/2