Fix autoloading for composer use case without breaking pear

[ralflang]

Packages need to update to the new doc/template/Horde/Test/packagetest/alltests.php and bootstrap.php for this to work.

Also, horde_test must be require-dev'ed

[yunosh]

1. Please don't change composer.json, it's generated automatically. If we need to change anything there, it must happen in horde-components.
2. Once we make Horde composer-installable, we should install all dependencies with composer too, instead of bundling them. To make this happen we also need to update to a composer-installable PHPUnit version. Just keep this in mind, even though it may make sense to not do all these changes at once.

[ralflang]

1. This is actually the output of the horde-components composer command from my patched "maintaina" git tree. I am really looking for a way to communicate that tree as a whole. Basically I have created a composer plugin for horde apps (needed because of web-visible parts) and horde libraries (mostly for js / core handling, but also handy for db migration files). See also thread in horde@

2. Totally agree, bundling is more of a pear-ready workaround and should be avoided if possible. Distributions also don't like it. It's just I cannot move all parts at the same time without losing focus.