Add zipdownload for WinOS and OS without system()

Fixed Download on Windows and make downloads possible for Servers
without system() access
Added check for zip extension

add the check for the zip-extension.
Fixed HTML Syntax Error
decide on delete if files should be keeped or syslinks followed
security checks to prevent unwanted changes
moved font back to theme
Merge pull request #262 from daeks/patch3

moved font back to theme
Merge git://github.com/Codiad/Codiad
Installer scroll, fixes #210
Fixes some install errors, part of #213 and #214
Merge remote-tracking branch 'upstream/master' into patch1
fixed minor issues
hide plus icon from projectbar if user has noaccess
Merge pull request #258 from ccvca/master

Add zip Download for Systems withoud tar-command
Merge pull request #260 from daeks/patch

decide on delete if files should be keeped or syslinks followed
Merge pull request #261 from daeks/patch1

security checks to prevent unwanted changes
Fix issue with search opening duplicate copy of file on result
update check
Change "Cancel" to "Close" to avoid confusion
logout user on download