#3 ss.php & ss-client.js

[Xi Li]

1. The "ss-client.js" is too big to manage. So we can create somen new .js file for new function(such as "ss-search.js" & "ss-rulers.js").

2. "A", "U", "G", "C", "T" and "N" are legal in sequence. An example "function isRNA(s)" in js/importcheck.js.

3. Wildcard characters "?" and "". "?": arbitrarily one character. "": arbitrarily characters.