Check for necessary farm constants instead of preload.php

This commit closes #7

Set the basedir conf for animals in an htaccess setup

see https://www.dokuwiki.org/farms#add_an_animal

Require the future basedir from the user and create a .htaccess

Return false if a operation fails

Add conf option for plugins disabled by default

Add edit class to checkboxes

Use dokuwiki zip library

Use dokuwiki libs for accessing variables

see issue #8

Update language strngs

See issue #3

Move servertype setup to one-time setup

Farmdir must not be in dokuwiki and be saved as an absolute path

closes #2, closes #4

Add more prose to create preload.php dialog

fixes #1

Upped version

Add more error conditions and lang strings

Download animal template into DOKU_FARMDIR

Move hard-coded texts to lang.php

Report errors for create preloadPHP

Move FormErrorfunction to helper function

Move reloading a adminpage to its own function

Move printed strings to lang files

Fix javascript namespace

Only use chosen if available

Fix errormessage output

Handle different adminsetups and add more errormessages

Fix fieldsets and buttons to choose admin setup