Added a partial fix of issue 93 to limit memory exhaustion.

This is not perfect because it means that we cannot get the
corresponding commit message and author for each file in the tree view.
This is just a work around that will not affect most of the repositories
but the biggest ones with files not changes for a long time.

To fully fix this problem, one needs to build at each commit time a
cache table with the data of each commit (including the hash of each
file at each commit).

src/IDF/templates/idf/source/git/tree.html

@@ -33,7 +33,7 @@
 <td class="fileicon"><img src="{media '/idf/img/'~$file.type~'.png'}" alt="{$file.type}" /></td>
 <td{if $file.type != 'blob'} colspan="4"{/if}><a href="{$url}">{$file.file}</a></td>
 {if $file.type == 'blob'}
-{if isset($file.date)}
+{if isset($file.date) and $file.log != '----'}
 <td><span class="smaller">{$file.date|dateago:"wihtout"}</span></td> 
 <td><span class="smaller">{$file.author|strip_tags|trim}{trans ':'} {issuetext $file.log, $request, true, false}</span></td>
 {else}<td colspan="2"></td>{/if}