proxies for FTP urls.

- Bug report #1792649 (http://curl.haxx.se/bug/view.cgi?id=1792649) pointed
  out a problem with doing an empty upload over FTP on a re-used connection.
  I added test case 541 to reproduce it and to verify the fix.

- I noticed while writing test 541 that the FTP code wrongly did a CWD on the
  second transfer as it didn't store and remember the "" path from the
  previous transfer so it would instead CWD to the entry path as stored. This
  worked, but did a superfluous command. Thus, test case 541 now also verifies
  this fix.

(to validate bug #1790403).

case 615 to test an SFTP upload failure.

and allow reuse by multiple protocols. Several unused error codes were
removed.  In all cases, macros were added to preserve source (and binary)
compatibility with the old names.  These macros are subject to removal at
a future date, but probably not before 2009.  An application can be
tested to see if it is using any obsolete code by compiling it with the
CURL_NO_OLDIES macro defined.

Documented some newer error codes in libcurl-error(3)

out that libcurl didn't deal with large responses from server commands, when
the single response was consisting of multiple lines but of a total size of
16KB or more. Dan Fandrich improved the ftp test script and provided test
case 1006 to repeat the problem, and I fixed the code to make sure this new
test case runs fine.

multiple lines (similar to test case 1003).

empty proxy server is selected.

out that libcurl didn't deal with very long (>16K) FTP server response lines
properly. Starting now, libcurl will chop them off (thus the client app will
not get the full line) but survive and deal with them fine otherwise. Test
case 1003 was added to verify this.

(http://curl.haxx.se/bug/view.cgi?id=1776235) about ftp requests with NOBODY
on a directory would do a "SIZE (null)" request. This is now fixed and test
case 1000 was added to verify.

range. They are about FTP but the 100-199 range is full.

HTTP PUT using Digest authentication. Test case 5320 and 5322 were also
added to verify the functionality.

after 7.16.2. This is much due to the different treatment file:// gets
internally, but now I added test 231 to make it less likely to happen again
without us noticing!

verifies the bug fix in #1757328.

Regev on the libcurl mailing list on 10 Jul 2007, converted to a test case.

using one of the so-called 'right' time zones that take into account
leap seconds, which causes the tests to fail (as reported by
Daniel Black in bug report #1745964).

of the patch he suggested.  Added his test case as test289 to verify.

chunked encoding (that also lacks "Connection: close"). It now simply
assumes that the connection WILL be closed to signal the end, as that is how
RFC2616 section 4.4 point #5 says we should behave.

tool reports and it was indeed a legitimate one and it is one fixed. It was
a use of a share without doing the proper locking first.

from the #1739100 bug report

disable test 351 by default by I add the test case anyway to make it easier
to work on this problem in the future.

to do nonlistening server tests, like other tests.

openssh

case 614.
Allow SFTP quote commands chmod, chown, chgrp to set a value of 0.

the default port numbers, allowing more than one test suite to run
simultaneously on the same host.