CVS log for interchange/code/SystemTag/captcha.coretag

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Keyword substitution: kv
Default branch: MAIN

Added License, version, and copyright info to captcha tag.

* Add file security checks.

* Document reset option.

* Make one image function, modified by parameters.

* Add relative and name-only options to control image function.

* Add reset=1 option to allow more than one captcha per page
  transaction (however unlikely that is to be needed).

* Changed docs to reflect this.

* Add example to docs.

* Add "captcha" capability to Interchange.

* Docs for captcha tag embedded in code/SystemTag/captcha.coretag.

* Short example:


	[if cgi mv_captcha_guess]
		[tmp good][captcha check][/tmp]
		[if scratch good]
			You guessed right!
		[else]
			Sorry, try again.
		[/else]
		[/if]
	[/if]

	[captcha imagetag]

	<form action="[process href="@@MV_PAGE@@"]">
	<input type=hidden name=mv_captcha_source value="[captcha code]">
	<input type=text name=mv_captcha_guess size value="">
	<input type=submit value="Guess">
	</form>

	[error auto=1]

* Also add ability to specify capability for creating new IC account
  in catalog.cfg:

	UserDB default captcha 1

  Combined with this code in pages/new_account.html:

	[if config UserDB->captcha]
    <tr>
      <td colspan=2>
        [captcha image_tag]
      </td>
    </tr>
    <tr>
      <td align="right" class="titletab_small">
        <b>[L]Letters above[/L]:</b>
      </td>
      <td align="left" class="titletab_small">
        <input type="text" name="mv_captcha_guess" value="">
      </td>
    </tr>
	[/if]

   will insist on user getting captcha correct before new account
   is generated.

* Not included by default as most sites don't have much problem.