hgmerge: fix diff+patch detection; cleanups
Details:
- actually show help message when no tools are found
- whitespace cleanup (stupid emacs)
- quote more variables
- simplify merge/diff3 error handling
#header#
<title>#repo|escape#: tags</title>
</head>
<body>
<div class="buttons">
<a href="?cl=tip">changelog</a>
<a href="?mf=#manifest|short#;path=/">manifest</a>
</div>
<h2>tags:</h2>
<ul id="tagEntries">
#entries%tagentry#
</ul>
#footer#