Add misc.css
new file:   border-styling.css
border-styling.css: Add some documentation.
border-pools.css: Add @-moz-document.
new file:   form-styling.css
misc.css: Add several sidebar tweaks.
post-icons.css: Tweak icon sizes and add some comments.
deleted:    border-size.css
renamed:    border-pools.css -> border-pool-indicator.css
renamed:    misc.css -> misc-tweaks.css
renamed:    post-icons.css -> thumbnail-icons.css