update for 2.7

git-svn-id: http:https://piwigo.org/svn/extensions/skeleton/trunk@28650 68402e56-0260-453c-a942-63ccdbb3a9ee

git-svn-id: http:https://piwigo.org/svn/extensions/skeleton/trunk@26137 684…

…02e56-0260-453c-a942-63ccdbb3a9ee

corrections and example of {html_style}, {html_options}, API info

git-svn-id: http:https://piwigo.org/svn/extensions/skeleton/trunk@23395 68402e56-0260-453c-a942-63ccdbb3a9ee

move files to trunk

git-svn-id: http:https://piwigo.org/svn/extensions/skeleton/trunk@21304 68402e56-0260-453c-a942-63ccdbb3a9ee