Issue #2484879 by Aron Novak, mr.york: Provide simple plain/text alternative without mailmime
Made some coding style fixes.
Issue #2001740 by iMiksu: Images not working in template when using language path prefix
Issue #1692966 by mrfelton: Incompatible with latest MailSystem code
Issue #2017179 by andremolnar: user_access called in hook_user presave can throw notices
Issue #1717604 by jacob.embree: HTML test mail page does not remember filter
Issue #2390351 by jacob.embree: Improve formatting, documentation, and use get_t()
Issue #1717600 by jacob.embree: wrong link in admin description
Issue #1744200 by Stevel, jacob.embree: Text cannot be translated.
Issue #1744200 by Stevel: Text cannot be translated.
Issue #1534688 by johan.wilfer, generalredneck: Remove forced line breaks between message array elements.
Cannot assume mailsystem module is loaded in hook_update_N().
Issue #1272248 by mrded: Remove h3 tags from fieldset titles on settings page as they break some custom themes.
Issue #1439442 by Chi: Fix broken link to echo module on configuration page.
Issue #1403924 by Road Runner, Berdir, fenstrat: Change simplenews template to use new simplenews API.
Ensure mailsystem.module is loaded before calling mailsystem_get() function.
Add blank lines between elements in the message body array.
Issue #1324980: Move mailsystem settings to the module configuration/test page so that a test mail may be sent via other MailSystemInterface implementations.
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