Fix how to safely use is_granted in error pages
Fix app.user check
[#2366] Fixed link
remove the pattern option in DateType
Documenting the virtual option for types where it makes sense.
document DateType limitations
breaking lines to <80 characters
Add 3rd party installation guide to cookbook.
moved note into separate include. removed blockquote from PHP manual
Fixed first wave of errors.
Fix second wave.
Fix third wave.
Fix versions.
Fixing some syntax issues
Fixed declared type of property 'traverse'.
Merge pull request #2359 from ftassi/fix-caution-note

Fix how to safely use is_granted in error pages
[#2359] Making check for app.user shorter
Merge pull request #2367 from WouterJ/issue_2366

[#2366] Fixed link
Missing interface in code example
Added missing use statement