Merge branch 'stable-2.6'
* stable-2.6:
Sort library JARs by last modified time
Defer loading site libraries until database opens
Prevent account's full name from being set to empty string
Update 2.6 release notes with mod_rewrite change
Update 2.6 release notes with more trivial_rebase fixes
Vertically align the "Choose:" header on the Become Any Account page
Cannot Become Any Account for account whose full name is empty string
init: Default database type to JDBC when url is present
Remove old library JARs when upgrading
