Resolve "Implement AttributeQuery as SAML IDP"

Closes #196

See merge request kit/reg-app/regapp!88

for a nameid.

change AQ attribute source to work with AA and not only with IDPs

Resolve "Add user update via e-mail callback"

Closes #206

See merge request kit/reg-app/regapp!84

Update HeadBarBean.java: correct new gitlab-url

See merge request kit/reg-app/regapp!87

place.

closes #207

Resolve "Add simple checkAccess method for SAML SPs"

Closes #209

See merge request kit/reg-app/regapp!86

for OIDC users on missing refresh token, got mixed with other commit.

for OIDC users on missing refresh token