adding docs

Author: antgonza

qiita_pet/support_files/doc/source/faq.rst

@@ -65,3 +65,17 @@ A few more instructions: for the example above the workflow should be:
    perform closed OTU picking against the latest version of Greengenes and can
    be quite time consuming depending on the number of samples and the depth
    of sequencing.
+
+.. _issues_unzip:
+
+How to solve unzip errors?
+--------------------------
+
+When downloading large zip files within Qiita there is a change that you will get
+an error like: **"start of central directory not found; zipfile corrupt"**. This issue
+arises from using old versions of zip and you need to have unzip >= 6.0.0. To check
+you unzip version you can run: `unzip -v`.
+
+To update your unzip for most operating systems you can simply use your regular package
+admin program. However, for Mac we suggest using
+`this version of unzip <ftp://ftp.microbio.me/pub/qiita/unzip>`__.

qiita_pet/templates/study_base.html

@@ -239,7 +239,8 @@
       <a class="btn btn-default btn-block" href="{% raw qiita_config.portal_dir %}/study/upload/{{study_info['study_id']}}"><span class="glyphicon glyphicon-upload"></span> Upload Files</a>
       <button class="btn btn-default btn-block" onclick="populate_main_div('{% raw qiita_config.portal_dir %}/study/new_prep_template/', { study_id: {{study_info['study_id']}} })" id="add-new-preparation-btn"><span class="glyphicon glyphicon-plus-sign"></span> Add New Preparation</button>
     {% end %}
-    <a class="btn btn-default btn-block" href="/download_study_bioms/{{study_info['study_id']}}"><span class="glyphicon glyphicon-download-alt"></span> All QIIME maps and BIOMs</a>
+    <a class="btn btn-default btn-block" href="{% raw qiita_config.portal_dir %}/download_study_bioms/{{study_info['study_id']}}"><span class="glyphicon glyphicon-download-alt"></span> All QIIME maps and BIOMs</a>
+    <div style="text-align: center;"><small><a href="{% raw qiita_config.portal_dir %}/static/doc/html/faq.html#how-to-solve-unzip-errors">Issues opening the downloaded zip?</a></small></div>
 
     <div id="data-types-menu"></div>
   </div>