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

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

Rename SimpleSAML_Session::getInstance() to SimpleSAML_Session::getSessionFromRequest(), and leave the former as deprecated.

Followup on previous commits. Use redirectUntrustedURL() as a shortcut, and let everything else make use of redirectTrustedURL(). Move the responsibility to check the input out of the library, to the places where URLs are grabbed from input parameters.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3332 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2209 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2206 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1873 44740490-163a-0410-bde0-09ae8108e29a

Update issue 207
Status: Started
Owner: andreassolberg
The document should be added to the documents at rnd.feide.no.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1823 44740490-163a-0410-bde0-09ae8108e29a