Enhancements to input and textarea CSS

Textarea and input is now the same font as other body text. Ensuring
all common input form elements (text, email, url) recieve form CSS.
Moved input/textarea background to the global level.
Pingback style fixes

Ensure that pingbacks are styled. Apply comment styles to pingbacks,
ensure reply link is not displayed for pingbacks and remove .pinglist
styles that are not used.
Ensure all buttons receive button style

This will ensure buttons used by contact form plugins, etc. get the
button style.
Provide more space before comment text begins
Add support for search and telephone input types
Make #content fill the entire page width when printed
Make the comments reply button and comments respond section invisible for print
Merge pull request #77 from TomLany/master

Enhancements to CSS for comments, input, textarea, pingbacks and buttons.