New "flags" option in the [markdown] section to customize
Misaka's Markdown HTML rendering.
By default, no flags are set.
```
[markup]
flags = skip-html, escape, hard-wrap
```
Update CHANGES.rst and add the section to the sample
isso.conf and isso-dev.conf
Automatically approve comments by an email address if that address has
had a comment approved within the last 6 months. No ownership verification
is done on the entered email address. This means that if someone is able
to guess correctly the email address used by a previously approved author,
they will be able to have their new comment auto-approved.
On server-side, this can be enabled by providing a base URL to use to
build the full URL. Limit also becomes configurable. On client-side,
we need to add a switch to know whatever or not the additional link
can be displayed.
* use a single default configuration, share/isso.conf
* try to use config.new in some tests which are decoupled
A few tests now depend on `isso.dist` to show that they (or the used
objects) have too much dependencies and need to be rewritten.
