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
Hotfix for UnderscoreNamingStrategy for 2.3, will be fixed properly in 2.4
#6207 - removing unused `@group` annotation
Merge branch 'hotfix/#6207-underscore-naming-strategy-not-studlycase'

Close #6207
Fixes typo algorihtm -> algorithm
Merge branch 'typo/#6213-typo-fix'

Close #6213
Console Adapter typo
Merge branch 'typo/#6215-console-adapter-typo'

Close #6215
Fixes typo : contructor -> constructor
Merge branch 'typo/#6217-callback-paginator-test-typos'

Close #6217
#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