import of dlcomment scripts from old system
adjustments for download comments in alix5
adjustments in download templates to show comment link
Merge branch 'alix5-pnw-dlcomments' into feature-dlcomments

Conflicts:
	www/admin/admin_dledit.php
	www/admin/admin_template_dl.php
	www/data/dlfile.php
	www/styles/lightfrog/0_downloads.tpl
alix6 adjustments for dl comments
minor adjustment
replace special characters by corresponding HTML entities
Merge pull request #78 from Thoronador/fix-entities

replace special characters by corresponding HTML entitieshttps://github.com/Sweil/Frogsystem-2/pull/78#
fix file name in require()
Merge pull request #79 from Thoronador/fix-warnings

fix file name in require()
update of English (US) language files to match current German files

(Note: Language files in admin/ are not updated yet, but the will
       follow in one of the next commits.)
update of English (US) language files, admin part

(Note: en_US language files should now match the current German
       language files again.)
Merge pull request #80 from Thoronador/feature-language-en_US

update of English (US) language files to match current German files
again: thanks a lot!
remove unnecessary file and add .gitignore
Merge pull request #82 from Thoronador/fix-thumbs.db

remove unnecessary file and add .gitignore
fix error in admin_dledit.php

When editing a download where some files are marked as mirror,
the mirror checkbox will not be checked due to incorrect HTML
syntax for the input element (caused by a typo). As a result
all "mirror" files in the edited download will be saved as
non-mirror files with the next update - unless the mirror flag
is set manually by the person editing the download.

The commit fixes that bug. It also fixes some minor spelling
mistakes in the script and removes the cause of a PHP notice.
fix for the fix
Merge pull request #83 from Thoronador/fix-dledit

fix error in admin_dledit.php
better compression for PNG files
Merge pull request #84 from Thoronador/fix-png-images

better compression for PNG files