[BUGFIX] RTE on first new IRRE record keeps loading in IE

Problem: IE raises a syntax error when it encounters html comments in
the JavaScript code. The html comments are added by the page renderer.
Solution: There is no need for the page renderer to wrap inline
javascript as html comments.

Resolves: #55457
Releases: 6.2, 6.1, 4.5
Change-Id: Iae180a73778ca3bb1c9934c887315b969888b10d
Reviewed-on: http://review.typo3.org/30240
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
[BUGFIX] Check if TER dump exists before modify time check

The modify time of the extensions.xml.gz file is used to display the last
update of the extension list. Checking if the file exists will prevent a
PHP warning.

Change-Id: Ic8cae6c591f0b6ff955fb01c192df9b17876fe68
Releases: 4.5
Resolves: #37946
Reviewed-on: http://review.typo3.org/21776
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>