comments: extend API data with references to commit_id or pull_request_id for audit-logs.

ldap: changed plugin to help with debugging and error handling. - mostly based from support.

files: add pre-commit checks on file operations to prevent loosing content while editing when repositories change. - fixes #5607

exception_tracker: store request info if available.

core: added user-notice logic to push notice messages. - will be used for exception tracker info - new version upgrades - dedicated important messages to the users

pull-requests: fixed case for GIT repositories when a merge check failed due to merge conflicts the pull request wrongly reported missing commits. - we're now searching for dangling commits in a repo that has them and cannot see them because of failed merge checks. - pull-request: will save metadata during merge simulation so merge conflicts are permanently stored, and showed to all users.

docs: remove SVN known issues as they are deprecated.

exc_tracker: disable send-email if mail server is not configured.

ldap: fixed ldaps port example to correct number.

docs: updated docs on local archives changes