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Revert "Rebuilt HTTPClient class as an extension of PEAR HTTP_Request2 package, adding redirect handling and convenience functions."
Going to restructure a little more before finalizing this...

This reverts commit fa379678.

Rebuilt HTTPClient class as an extension of PEAR HTTP_Request2 package, adding redirect handling and convenience functions.
Caching support will be added in future work after unit tests have been added.

* extlib: add PEAR HTTP_Request2 0.4.1 alpha
* extlib: update PEAR Net_URL2 to 0.3.0 beta for HTTP_Request2 compatibility
* moved direct usage of CURL and file_get_contents to HTTPClient class, excluding external-sourced libraries

Note some plugins haven't been tested yet.

Conflicts:

	install.php

Conflicts:

	install.php

Conflicts:

	install.php

Abstracted a couple of hardcoded lists of mysql/pgsql checks and radio button creation to use a nice little array of names, installer funcs, and modules to check.
Only those DB types whose modules are present will be presented in the installer; if all are missing, we throw an error and list out all the possibilities we were looking for.

* notice on main installer form checking for $_GET['checklibs']
* notices when seeing which module checks to run
* warnings when attempting to load include files

Check that 'dl' function is available and usable before trying to call it with error suppression; if it's disabled or unavailable we end up with mysterious failures during installation or loading of libraries.

Fixed for StatusNet installer as well as some external libraries that should be fixed upstream if they haven't already been:
* PEAR
* Auth/OpenID
* Auth/Yadis

Fixes http://status.net/trac/ticket/1844

fix for postgres - was using a non-existent variable to work out if should write quote_identifiers=true

This provides a pure PHP implementation of the gettext functions.

This should help get laconica running on shared hosting environments where PHP's gettext module may not be installed.
Also gets us one step closer to running on Mac OS X 10.5 with Apple's preinstalled PHP, which doesn't provide an easy way to add modules.

Source: http://savannah.nongnu.org/projects/php-gettext
Copyright (c) 2005 Steven Armstrong <sa at c-area dot ch>
GPLv2 or later

bug on line 381 referred to non existant variable, and caused a php notice and potentially would create a misconfigured config.php database type setting.

tidyed up configuration file generation, removing duplication from db functions,

tidyed up configuration file generation, removing duplication from db functions,