automatic code style fixes

implement password expiry warnings. fixes #4

make use of file system caching optional

new approach for recursive groups

Instead of implementing the recursion client side, we ask the AD server
to resolve nested group memberships for us. This saves potentially many
network requests but

new approach for recursive groups

Instead of implementing the recursion client side, we ask the AD server
to resolve nested group memberships for us. This saves potentially many
network requests but may have performance penalties on the AD server
side. However it ensures, we can't make a mistake and thus makes our
code safer to run - also turns out my first attempt was checking nested
groups backwards.

See https://stackoverflow.com/q/40024425 for more discussions on
performance for this.

A config option allows to use the former much faster approach for setups
without nested groups.

Still to do: supporting user lookups by group this way.

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first go at SSO

This basically copies the functionality from authAD

make the primary group configurable

Because the Domain Users group can be localized, this makes it
configurable. The authAD library had a config to use "real" primary
groups where it would look up t

make the primary group configurable

Because the Domain Users group can be localized, this makes it
configurable. The authAD library had a config to use "real" primary
groups where it would look up the primary group by calculating the SID
and doing another check. We could copy that mechanism if needed later
on.

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allow fetching of additional user attributes

Currently we reuqest all attributes from the server and only filter
later. This needs fixing.

make page size configurable

The default of 1000 will quickly exhaust the memory available on typical
PHP setups. This lowers it to 150 which should be fine as is for
virtuallly everyone.

fix admin user access

some cleanup for the options

added bulk data retrieval

first working login with active directory

wizard generated