Add history of supplementary comments

Changes:
* Remove RevisionDelete delete log
** Remove class RevisionCommentSupplementManualLogEntry
** Remove class RevisionCommentSupplementLogPage
* Special pages files move to special directory
* SQL files move to sql directory
* Split up RevisionCommentSupplement.hook.php
  into RevisionCommentSupplement.hook.php
  and RevisionCommentSupplementLogFormatter.php
* Add history of supplementary comments
** ViewRevisionCommentSupplementHistory.php
** ViewRevisionCommentSupplementHideHistory.php
** class RevisionCommentSupplementHistory
   into RevisionCommentSupplement.class.php
** class RevisionCommentSupplementHideHistoryLogFormatter
   into RevisionCommentSupplementLogFormatter.php
** function onLogLine into RevisionCommentSupplement.hook.php
** rev_comment_supp_history table
** messages
** buildHistory.php
* Fix bug of value of timestamp when saving supplementary comment
* Add .htaccess into maintenance directory
* Add RevisionCommentSupplementSetting.php
* Add $egRevisionCommentSupplementSettings
* Update README
* Standardize naming
** Rename comment to supplement
** Rename summary to reason
* Rename keys of supplementary comments on log
** comment1 to oldsupplement
** comment2 to newsupplement
** Add fixLogParams.php
* Change massages
** Modify messages
** Add messages
** Rename keys
*** revcs-error-denied to revcs-error-edit-denied
*** revcs-form-* to revcs-edit-*
*** revcs-history-supplement to revcs-action-history-supplement
*** revcs-list-extended-comparison-equals
    to revcs-list-extended-comparison-equal
*** revcs-list-extended-comparison-not-equals
    to revcs-list-extended-comparison-not-equal
*** revcs-list-rcs-comment to revcs-list-rcs-supplement
*** revcs-preview-summary to revcs-edit-preview-reason
*** revcs-preview-supplement to revcs-edit-preview-supplement
*** revcs-written to revcs-edit-written

Change-Id: I48b42fc08cacb9d9b5338860c61bca10b6cc8341