Display correct day of the week with negative UTC offset

A duplicate subtraction of the UTC offset and DST time caused the creation
of an incorrect timestamp. In return this caused us to go back too far and
therefore moved us back one day.
Merge pull request #116 from marc1706/calendar/one_day_off

Display correct day of the week with negative UTC offset
Merge pull request #132 from marc1706/ticket/120

[ticket/120] Move birthday block HTML to template files
[ticket/224] Add possibility to append username to donation

B3P-224
Merge pull request #140 from marc1706/ticket/224

[ticket/224] Add possibility to append username to donation
[ŧicket/223] Set correct permissions to uploaded files (644)

phpbb_chmod() only sets the owner permissions. As we need to set the
permissions for all users, it is not possible to use phpbb_chmod().

B3P-223
Merge pull request #142 from marc1706/ticket/223

[ŧicket/223] Set correct permissions to uploaded files (644)
[feature/clean-up] Remove duplicated code from portal modules

B3P-CU
Merge pull request #143 from marc1706/feature/clean-up

[feature/clean-up] Remove duplicated code from portal modules
[gh/113] Update UMIL to 1.0.5

B3P-GH-113
Merge pull request #144 from marc1706/gh/113

[gh/113] Update UMIL to 1.0.5
[update/2.0.2] Update files for 2.0.2 release

This includes an update of MODx to 1.2.6

B3P-UPDATE-2.0.2
Merge pull request #145 from marc1706/update/2.0.2

[update/2.0.2] Update files for 2.0.2 release
[fix/xml] Use dependency again for mod version check links

B3P-FIX_XML
Merge pull request #146 from marc1706/fix/xml

[fix/xml] Use dependency again for mod version check links
[remove/format_birthday] Remove useless function format_birthday()

B3P-RM-FORMAT_BIRTHDAY
Merge pull request #147 from marc1706/remove/format_birthday

[remove/format_birthday] Remove useless function format_birthday()
[translate/changes] Translate 2.0.2 changes to German

B3P-TRNS-CHANGES
Merge pull request #148 from marc1706/translate/changes

[translate/changes] Translate 2.0.2 changes to German
[ticket/226] Use $this->c_class instead of $c_class

B3P-226