Avoid exception when editing values with no clientRects

Originally by Thomas Andersen, see issue 6884.
Issue 6899 (Exception when clicking outside of the inline editor's
input)
http://code.google.com/p/fbug/issues/detail?id=6899
Fixed formatting
Issue 6900: The "Show inline event handlers" option should only apply to built-ins

https://code.google.com/p/fbug/issues/detail?id=6900
Issue 6748: Allow searching by selector/xpath in the HTML panel

https://code.google.com/p/fbug/issues/detail?id=6748
Use custom search field placeholders for HTML and Script panels

Related to issue 6748.
FBTest: Update HTML panel search test for selector searches
Introduce a new API Xml.isElementHTMLOrXHTML
When starting inline editing the text in it should be preselected
(related to issue 6899)
Merge branch 'master' of https://github.com/firebug/firebug.git
[firebug-1.13.0a4]
6895: Only select the string without quotes when editing a string property
- pass a selectionRange for string the editor's startEditing method
- FBTest
Replaced deprecated "nodeValue" property by "value"
6895: Only select the string without quotes when editing a string property
- Complete steps in FBTest html file ;)
Updated "string" lib to fix some display errors with messages containing
arrow brackets
(also added "xpcom" lib, which is required by "string")
Merge pull request #107 from thomasandersen/issue6895

Issue 6895 (Only select the string without quotes when editing a string property)
http://code.google.com/p/fbug/issues/detail?id=6895
Issue 6892: 	Split firebug/firebug module into several modules and fix dependencies
Merge branch 'master' of github.com:firebug/firebug
Comments (related to issue 6892)
FBTest: disable css/5000 test (causing Fx crash, see bug 927413)