Add example aliases to filters.
'hl' macro prints plain text instead of error for .man files.
Add added-in-version flag to filters.

Add ditaa filter.
Add option to map input to output extensions (not used yet).
Allow adding extra info for each page to index page.
Make it possible to sort Node objects.
Open log file with utf encoding, not ascii.
Add go filter.
Add tidy example to related filters.
Add gotest filter.
Separate bash and sh filters. Closes #42
Don't try to separate filter-specific from inherited settings.
Make pygments stylesheets available in website templates.
Add optional http auth to static server.
Use custom realm in both locations where it is used.
Add forgiving error handling to id parser.
Remove print statement left in.
Fix for lyx bug where <#1> tags look like jinja comments. Closes #45
Fix interpretation of 127 exit code from running just-compiled code. Closes #48.
Implement mkdir feature. Closes #47.
Move mkdirs code into main filter class, make it not clash with
populate. Closes #50.