Fix pluginmanager accordion as follows:

1. Add JS Hint settings.
2. Allow all accordions to be closed (more user friendly).
3. Fix spelling iniAccordian -> iniAccordion.
4. Slightly more responsive page load (check for all ajax loads more
frequently).
5. On load only open first plugin accordion if 1 plugin.
6. Fix bug which showed second accordion rather than first i.e.
display(1) should be display(0).
7. Show "Please select" as accordion heading when plugin has not yet
been selected (rather than blank).
8. HTML improvements - ajax code is loaded insite accordion-body rather
than after it  - looks slightly better.
9. Add debugging console messages.
10. Use fconsole rather than console.log for ajax errors.
11. Nicer ajax error messages and speeling mistook korrekted.
12.  Renaming of ids, names and fors now comprehensively handled on
plugin delete.
Additional enhancements

13. Faster animation to make it more responsive.
14. Accordion heading show "loading..." during ajax.
Add minified version.
Merge pull request #1055 from Sophist-UK/enhance_admin_pluginmanager_accordion

Fix admin element validation (plugin manager):