Offer to choose ACL policy etc.

SPR-507, closes #24

check for libgd support before creating an icon

make sure HTTP_HOST exists. fixes waring on command line

show trailing slash in info

added help text on plugin management

reworked plugin logic

Animals can inherit the plugin state from the farmer. Their configs can
now be reset to the default state which is either on or whatever is set
in the farmer (when inheriting).

DOKU_FARMDIR should always have a trailing slash

fixed plugin managing when no local config exists, yet

use the plugin controller to list the plugins

don't copy users if they are inherited anyway

fixed generating new user

typos fixed

added German translation

without the help texts for now

moved template to includes

unused file removed

reenabled the support for the disabled plugin setting

isInPath should not allow $path == $container

added tab to delete animals #19

Adjusted .htaccess generation

The rewrite rules have to come before any other rules and should not
contain an path information.

adjusted language for new behaviour

copy an animal when creating a new one #15

language cleanup

explicitly sort by alphabet when hostname length is same

Should fix tests

fixed tests

removed unused methods