Adds elFinder debug output to show tmbPath write status
Adds elFinder debug output to show tmbPath and its is_dir & read status
Fixes elFinder thumbnail problem on linux servers
OS independant fix for elFinder thumbnail problem on linux servers (since we broke windows servers); also fix 'links' toolbar icon
Updates changelogs and removes old jquery file
Adds check to ensure (new) less compiler exists, otherwise use orginal lessphp
Clears an issue with error messages (issues) being displayed in ajax content when error reporting was turned on.  We DO want to see warning and errors, but NOT issues (e.g., a call to @unlink is written to suppress an error if the file doesn't exist)
Changes ajax error reporting to follow a new setting AJAX_ERROR_REPORT which defaults to off, so it isn't always on since most ajax responses are json
Merge branch 'develop' into bootstrap3dave