Fix checkbox tooltip

and eliminate unneeded variable setting as it is defaulted to this in
element.php
tiny work on packages
Empty tooltips appearing

This avoids empty tooltips appearing on fields without element or
validation tooltips set.
Improve error handling of tip eval
Improve label cursor for labels without tooltips
small tidy up
uhu
fixed empty dates were being incorrectly set when in form view
mend
fixed: dropdown element filter as chx, with more than one option selected and another filter selected. the dropdown where statement was not wrapped in brackets resulting in incorrect records being shown in the filter
removed db join select list tmpl files - they must have been added by mistake by one of us
updated admin layout for juser form plugin, altered form plugins delete button to be more bootstrappy
Fix double // when root folder is '/'.
Merge pull request #947 from Sophist-UK/fix_image_element_path_stuff

Fix image element path stuff
Merge pull request #944 from Sophist-UK/fix_empty_tooltips_appearing

Fix empty tooltips appearing
Merge pull request #917 from Sophist-UK/fix_checkbox_tooltip

Fix checkbox tooltip