json files being stored at end of each session
Merge branch 'master' into jsonMultiSession
**Features:

- Multiple session experiments are back and better than ever

**Changes:
- the multisession flag marker is *NewSession*
- `FQdata.php` now redirects to `done.php` instead of waiting for `FinalQuestions.php` to not find a new question (cleaner)
- Added an "ExperimentFinished" at the end of `$_SESSION['Trial']` (useful so people who lose their verification code can login and the program will give it back to them)
- `next.php` uses the "ExperimentFinished" flag to send to `FinalQuestions.php`
- `trial.php` will also use the "ExperimentFinished" flag to redirect to `done.php` (for people who login in but have already done the experiment)

**TO-DO:
- Remove all the old unnecessary code for the old style of multiple session experiments
- Reorganize `login.php` to be more clear

**Problems:
- Must update getdata to not look for session > 1 status-begin
- Must update getdata to not look for session > 1 instructions
- Must update getdata to not look for session < last final questions

** Bugfixes:
-fixed unclosed tag in readable();

** Style:
-Changed trial diagnostics to use single quotes and concat for consistency with the rest of the code
- Changed settings.php to use single quotes for consistency