[ic] File upload: tested solution & comments

[interchange-users@icdevgroup.org (Marco Mescoli)]

uploadedit allows  select an upload file.
uploadfile checks for errors, save the file, display the contents.
Tested for:
1) Normal upload operation
2) Input null file name
3) Input not existent client file name
4) Improper server save path

--------------
uploadedit.html ----------------------------------------------------

  <form action="[process-target]" method="POST"
enctype="multipart/form-data">
    <input type="hidden" name="mv_todo" value="return">
    <input type="hidden" name="mv_nextpage" value="uploadfile">
    File to upload:
    <input type="file" name="uploaded_file">
    <br><br>
    <input type="submit" name="mv_check" value="Send">
  </form>
--------------
uploadfile.html ----------------------------------------------------
  [tmp interpolate=1 name=not_null_file_name][value-extended
name=uploaded_file test=isfile][/tmp]
  [tmp write_result][value-extended yes="Success" no="Failed" ascii=0
name=uploaded_file outfile="tmp/test_file"][/tmp]
  [tmp contents][value-extended name=uploaded_file file_contents=1][/tmp]
  <br>
  [if scratch not_null_file_name]
    Good file name<br>
  [else]
    Null file name<br>
  [/else]
  [/if]

  [if scratch write_result eq 'Success']
    Save file Ok<br>
  [else]
    Cannot save file<br>
  [/else]
  [/if]

  [if scratch contents]
    File contents=#<pre>[scratch contents]</pre>#<br>
  [else]
    Null file contents<br>
  [/else]
  [/if]