Fixed issue Remove escape character (\) from any field evaluated by EM.

Dev only applies to escaped curly braces

classes/expressions/ExpressionManager.php

@@ -1829,6 +1829,7 @@ public function sProcessStringContainingExpressions($src, $questionNum=0, $numRe
             $errors = array_merge($errors, $this->RDP_errs);
         }
         $this->prettyPrintSource = $prettyPrint;    // ensure that if doing recursive substition, can get original source to pretty print
+        $result = str_replace(array('\{', '\}',), array('{', '}'), $result);
         $this->RDP_errs = $errors;
         return $result;
     }
@@ -2414,6 +2415,8 @@ static function UnitTestStringSplitter()
 What about an { expression nested {within a string} that has white space after the opening brace}?
 This {expression has {a nested curly brace { plus ones with whitespace around them} - they should be properly captured} into an expression  with sub-expressions.
 This {is a string {since it does not close } all of its curly} braces.
+This uses \{escaped curly braces\} which should generate output showing curly braces without the escapes
+This uses a double curly brace syntax, like that used for \{\{placeholders\}\} and Yii \{\{tables\}\}
 Can {expressions contain 'single' or "double" quoted strings}?
 Can an expression contain a perl regular expression like this {'/^\d{3}-\d{2}-\d{4}$/'}?
 [img src="images/mine_{Q1}.png"/]

classes/expressions/LimeExpressionManager.php

@@ -6882,6 +6882,7 @@ static function UnitTestProcessStringContainingExpressions()
             );
 
             $tests = <<<EOD
+<b>This example shows escaping of the curly braces</b><br/>\{\{test\}\} {if(1==1,'{{test}}', '1 is not 1?')} should not throw any errors.
 <b>Here is an example of OK syntax with tooltips</b><br/>Hello {if(gender=='M','Mr.','Mrs.')} {surname}, it is now {date('g:i a',time())}.  Do you know where your {sum(numPets,numKids)} chidren and pets are?
 <b>Here are common errors so you can see the tooltips</b><br/>Variables used before they are declared:  {notSetYet}<br/>Unknown Function:  {iff(numPets>numKids,1,2)}<br/>Unknown Variable: {sum(age,num_pets,numKids)}<br/>Wrong # parameters: {sprintf()},{if(1,2)},{date()}<br/>Assign read-only-vars:{TOKEN:ATTRIBUTE_1+=10},{name='Sally'}<br/>Unbalanced parentheses: {pow(3,4},{(pow(3,4)},{pow(3,4))}
 <b>Here is some of the unsupported syntax</b><br/>No support for '++', '--', '%',';': {min(++age, --age,age % 2);}<br/>Nor '|', '&', '^': {(sum(2 | 3,3 & 4,5 ^ 6)}}<br/>Nor arrays: {name[2], name['mine']}