Instead of throwing an exception for all assertion failures, simply log
an error with a stack trace. PHP will still abort execution if
assert.bail is enabled.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2027 44740490-163a-0410-bde0-09ae8108e29a

Change the SimpleSAML_Error_Assertion class to inherit from
SimpleSAML_Error_Exception, to signal it being an internal error.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1588 44740490-163a-0410-bde0-09ae8108e29a

Remove the getAssertionBacktrace() function, which isn't used anywhere.
This function is also a bit misleading, since it doesn't actually return
the backtrace from where the assertion failed.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@1562 44740490-163a-0410-bde0-09ae8108e29a

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@793 44740490-163a-0410-bde0-09ae8108e29a