if admin file tab errors with 401, redirect to login page [#61490238]
add logging with times for svn calls when loading files for publication; only svn update when necessary [#61429746]
lookup up publication/preview load time for all displayed files at once instead of one by one [#61429746]
drop date loaded to preview from admin list, for efficiency [#61429746]
fix jquery tab init so loading text is displayed for first tab as well as subsequent tab loads