Update Formo (now allows double-extension templates), revise config to match.
Rename Gallery's Formo templates from *.php to *.html.php (rename-only commit).

--HG--
rename : modules/gallery/views/formo/field_template.php => modules/gallery/views/formo/field_template.html.php
rename : modules/gallery/views/formo/form_template.php => modules/gallery/views/formo/form_template.html.php
rename : modules/gallery/views/formo/group_template.php => modules/gallery/views/formo/group_template.html.php
rename : modules/gallery/views/formo/opts/checkboxes_template.php => modules/gallery/views/formo/opts/checkboxes_template.html.php
rename : modules/gallery/views/formo/opts/radios_template.php => modules/gallery/views/formo/opts/radios_template.html.php
rename : modules/gallery/views/formo/opts/select_template.php => modules/gallery/views/formo/opts/select_template.html.php
Revise Gallery's formo config to find newly-renamed files.
Merge pull request #335 from shadlaws/formo_template_ext

Formo template ext