Add link to Posts in user backend pages when chorus

This provides easy navigation to the logged in user's posts, since
there's no direct link to their blog otherwise.

Ref T681

templates/base.tmpl

@@ -36,6 +36,7 @@
 				</nav>
 				{{end}}
 				<nav class="tabs">
+					{{if and (and (not .SingleUser) .Chorus) .Username}}<a href="/{{.Username}}/"{{if eq .Path (printf "/%s/" .Username)}} class="selected"{{end}}>Posts</a>{{end}}
 					<a href="/about"{{if eq .Path "/about"}} class="selected"{{end}}>About</a>
 					{{if and (and (not .SingleUser) .LocalTimeline) .CanViewReader}}<a href="/read"{{if eq .Path "/read"}} class="selected"{{end}}>Reader</a>{{end}}
 					{{if and (and (and (not .SingleUser) .Chorus) .OpenRegistration) (not .Username)}}<a href="/signup"{{if eq .Path "/signup"}} class="selected"{{end}}>Sign up</a>{{end}}

templates/user/include/header.tmpl

@@ -45,6 +45,7 @@
 			{{end}}
 			<nav class="tabs">
 				{{if .SimpleNav}}
+					{{if and (and (not .SingleUser) .Chorus) .Username}}<a href="/{{.Username}}/"{{if eq .Path (printf "/%s/" .Username)}} class="selected"{{end}}>Posts</a>{{end}}
 					<a href="/about">About</a>
 					{{if and (and (not .SingleUser) .LocalTimeline) .CanViewReader}}<a href="/read">Reader</a>{{end}}
 					{{if and (and (and (not .SingleUser) .Chorus) .OpenRegistration) (not .Username)}}<a href="/signup"{{if eq .Path "/signup"}} class="selected"{{end}}>Sign up</a>{{end}}