DateBoxAppended can now set an alternate size and alignment for the textbox.

DateBoxBase can now also set the alignment for the textbox.
Add constructor with target parameter to open link in new window/tab
Merge pull request #314 from jkpl/dateboxfeatures

Alternate size and alignment in DateBoxAppended
Merge pull request #316 from JulienNexonia/master

Target parameter in NavLink
Merge remote-tracking branch 'upstream/master' into dateboxfeatures2