Misc updates

- x/total added next to percentage at lists on the results page
- standard / purpose-oriented grid is now chosen using a parameter in config
- filtering by response submission time on results page loading
- alterations of the colour schemes
- choosing between background colour variables for photos using 1, 2, ... keys
Fix a bug in priority and stats calculations caused by problems with assigning array variables by reference in php.
Change the cursor above controls from pointer to default to avoid its constant flickering
Misc changes

- Fix bugs in ordering (too small or big values were not handled properly) 
- Filling of photos according to the source
Further fixing of result lists ordering