Improve word_wrap behavior by using in-browser Javascript to indent all wrapped lines so that the line-numbering column stays clear of wrapping text.
Change default word_wrap setting to true and reduce default font_size to 90%.

The default font_size of 100% was just too large when word_wrap is set to true; most users were in fact running with word_wrap=false and therefore were unknowingly relying on the browser to downscale too-wide text for them (which the browser may or may not do per its own rules). 90% seems like a better "fixed size" default for most people and common buffer-widths, thus making a default of word_wrap=true still produce a nice looking result in most cases.