Change documentation from recommending 2048 bit keys to using 3072 bit
keys.

Given that we're recommending people generate ten-year keys, 2048 bit
keys are probably a bit short. Almost all commercial certificate
authorities now recommend 4096 bit keys, and eduGAIN requires 3072 bit
keys for new federations.

This change aligns the SimpleSAMLphp documentation with the lower
eduGAIN requirement, since that still meets most standards bodies
recommendations for 2028 (ten years from now). cf
https://www.keylength.com/

It can now be used with \SimpleSAML\Auth\Simple, although the old name still works too.

Issue a notice when the option is used nonetheless.

Closes: #432

Change the extension of the documentation files from .txt to .md so that they can processed as markdown and displayed in github.

Add a method to SimpleSAMLphp_SessionHandlerPHP to restore a session existing previously to our own session. This can be used in SimpleSAML_Session to restore the PHP session status previous to calling our API, while also guaranteeing that our session is correctly saved. The documentation has been updated to reflect this and recommend how to deal with conflicting PHP sessions. This closes #244 and resolves #349.

* Remove 404 link to SSP news; this is covered on simplesamlphp.org now.
* Make screenshots link relative, so docs don't trigger insecure
  content warnings.
* Compress png images.

(being respectful with occurences that might change the behaviour, i.e. default database prefixes)

This is more than just cosmetics, as the rnd.feide.no links redirect
people to the SSP 1.5 documentation which is rather outdated.

Removing the simplesamlphp-ukaccess page in documentation. Improving docs on automated metadata management. Issue #608.

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Fixes issue 262.

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Adding support for the IdP-first flow with SAML 2.0, where there is no authentication request, and an unsolited response is sent back to the SP.



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