MDL-24779 mod/hotpot tidy up calls to js_value() method which escapes and encodes unicode strings for javascript

HotPot module: differentiate between "guesses-correct" (JCloze) and "guess-correct" (JCross, JMatch, JMix, JQuiz) in HotPot xml files and fix PreloadImages function for multiple images

fixes for XHTML strict: add <fieldset> arround hidden form fields, use "id" instead of "name" to locate forms, use HTML entities in button captions <= and =>

JCloze: set textbox size allowing for minimum gap size setting and longest answer;
JMatch: allow for duplicates and distractors in RHS items;
JQuiz: set textbox size allowing for longest answer, and use textarea if answer longer than 29 chars;

add HP 6.2 templates; add compatability with Safari (Mac browser); microincrement version to 2006091202 (release 2.2.1)

make compatible with PHP 5.1.2 by removing variable assignments in calls to functions e.g. myfunction($a=1); Micro-incremented version number to 2.1.15

added some reporting for HP5 (v5 and v6) quizzes; improved reporting on JCross and JQuiz multichoice; some modifications to prepare for upcoming "mobile" output format; corrected positioning bug when IE displays feedback box on long reading

  - click-by-click reporting
  - manipulate "chains" of hotpot activities
  - standardized reporting across all quiz types
  - several smaller features