[Security][Acl] Issue #5787 : Added MutableAclProvider::deleteSecurityIdentity

Code style fix and documentation typo
remove deprecated constraints calls (Min, Max, MaxLength, MinLength)
[Form] Fixed memory leak in FormValidator
Set the font-weight for links to 'normal', to prevent ugly bold links.
[Intl] make currency bundle merge fallback locales when accessing data, allowing use of country-specific locales
Fix finder date constraints and tests
[Routing] added working test case for issue #5135
[Process] Renamed flushOutput() and flushErrorOutput() to clearOutput() and clearErrorOutput()
added content length header to BinaryFileResponse
bug #9412 [HttpFoundation] added content length header to BinaryFileResponse (kbond)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #9412).

Discussion
----------

[HttpFoundation] added content length header to BinaryFileResponse

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9256, #7684
| License       | MIT
| Doc PR        | n/a

Commits
-------

e75a556 added content length header to BinaryFileResponse
update CONTRIBUTORS
fixed issue with clone now the children of the original form are preserved and the clone form is given new children
[Form] fix and unify phpdoc
[FrameworkBundle] fix routing container parameter exception message

also improve regex performance and fix implementation-specific written tests and typo
minor #9370 [FrameworkBundle] add test for #5135 and simplify routing container parameter resolution (Tobion)

This PR was merged into the 2.2 branch.

Discussion
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[FrameworkBundle] add test for #5135 and simplify routing container parameter resolution

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Fixes   | #5135
| Tests pass?   | yes
| license?      | MIT

1. [FrameworkBundle] added working test case for issue #5135
2. [FrameworkBundle] fix routing container parameter exception message which did not really make sense and improve regex performance

Commits
-------

719e037 [FrameworkBundle] fix routing container parameter exception message
8513ac9 [Routing] added working test case for issue #5135
minor #9425 [Form] fix and unify phpdoc (Tobion)

This PR was merged into the 2.3 branch.

Discussion
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[Form] fix and unify phpdoc

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| license?      | MIT

- Fixes FormTypeGuesserInterface that must return ValueGuess for guessRequired etc. instead of abstract Guess because its excepted for example by FormFactory.
- Unify array typehints that was not done consistently.

Commits
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7a754c3 [Form] fix and unify phpdoc
bug #9416 fixed issue with clone now the children of the original form are preserved and the clone form is given new children (yjv)

This PR was merged into the 2.3 branch.

Discussion
----------

fixed issue with clone now the children of the original form are preserved and the clone form is given new children

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 9414
| License       | MIT
| Doc PR        |
this commit fixes #9414

Commits
-------

b952bcb fixed issue with clone now the children of the original form are preserved and the clone form is given new children
[DependencyInjection] fixed YamlDumper did not make services private.
bug #9431 [DependencyInjection] fixed YamlDumper did not make services private. (realityking)

This PR was merged into the 2.2 branch.

Discussion
----------

[DependencyInjection] fixed YamlDumper did not make services private.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

The YamlDumper class (unlike the XmlDumper) currently doesn't make services private. This pull request fixes this.

Commits
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e8c2082 [DependencyInjection] fixed YamlDumper did not make services private.
slovenian translations fixed