Log Message:
Update to 2.4.1

* This version works with PHP 7.1.5

Changelog:
2.4.1:
0022428: [markdown] CSV and Excel exports with markdown on (vboctor)
0022906: [security] CVE-2017-7620: Open redirection vulnerability in \ 
/login_page.php (dregad)
0022909: [security] CVE-2017-7620: CSRF - Arbitrary Permalink Injection (dregad)
0022867: [markdown] Markdown formatting is broken for notes column on View \ 
Issues page (vboctor)

2.4.0:
0021558: [ui] log destination for page produces messed output (syncguru)
0022665: [documentation] Wrong documentation of option \ 
bug_resolution_fixed_threshold (atrol)
0022689: [bugtracker] HTTP_X_FORWARDED_PROTO is not honored when loading \ 
Gravatar (vboctor)
0022744: [signup] Signup is not working on mantisbt.org/bugs (vboctor)
0022740: [performance] Allowed memory size of 268435456 bytes exhausted (vboctor)
0004235: [authentication] Support Generic Authentication through Plug-ins (vboctor)
0022140: [administration] Getting error dialog when reporting issues and file \ 
upload is disabled (cproensa)
0022635: [time tracking] Empty notes with time tracking show as empty notes for \ 
users that can't view time tracking (vboctor)
0022673: [attachments] Dropzone uploads files when submitting other forms (cproensa)
0022762: [api rest] Bug in error handling when user doesn't have access level to \ 
handle issue (vboctor)