Fixed charset support for Pdo_Pgsql.
fix HeadLink docblock method declaration hints
Fix E_DEPRECATED message
Edit test suit about deprecated using of safe option
#6218 - applying hotfix for `iconv.internal_encoding` deprecation

See https://wiki.php.net/rfc/default_encoding

 > PHP 5.6 and master, introduce new php.ini setting. Old iconv.*/mbstring.* php.ini parameters will be removed for master PHP6. Use of iconv.*/mbstring.* php.ini parameters raise E_DEPRECATED for 5.6 and up.
Fix double registration of a complex type

Zend\Soap\Wsdl\ComplexTypeStrategy\DefaultComplexType::addComplexType()
stores already added classes under the methods argument `$type`.

Therefore a class with preceding backslash is treated like another complextype
than the same class without given backslash. As a result the xsd:ComplexType
definition is found twice (with exactly the same name) in the generated wsdl.
Fixes typos
Merge pull request #6219 from Ocramius/hotfix/#6218-iconv-internal-encoding-deprecated-in-php-5.6

#6218 - applying hotfix for `iconv.internal_encoding` deprecation
Merge branch 'hotfix/6219'

Close #6219
Merge pull request #6237
Merge pull request #6237 in master
Fix: CS of closure
Fix invalid step error caused by DST
remove unused use
CS
#6245 - single quotes for string values without interpolation
#6245 - adding coverage and group annotations
Merge branch 'hotfix/#6245-invalid-date-step-error-with-dst'

Close #6245
Fixes #6188
added missing full stop