BOINC main page fixes and corrections - "index php" and "white.css"

[Simek]

I tried to make it more HTML 4.01 Transitional valid. Before changes validator noticed 56 errors. No should be better.

Changelog (index.php):

• some HTML properties changed into CSS style,
• deleted <b> tags from links because bold for "a" is define in CSS file,
• replaced four or more spaces with tabs,
• added \" marks into HTML properties,
• some missing close tags added,
• other trivial improvements.

Changelog (white.css):

• merged "pre" style properties,
• merged "select.selectbox" and "input.small" because styles are same,
• replaced four or more spaces with tabs,
• other trivial improvements.