Improve website search from application.

[Stephane-D]

Improve web search algorithm on the web site.
For instance if i want to install the micro manager plugin i expect to find it in Icy by taping "micro manager" in the search bar. But it actually does not find it, because the name of the plugin is "Micro-Manager". That is a simple example but there are tons of case where we can't find something from simple keyword.
In my opinion entered words should be handled as simple keywords (case ignored) with AND condition (each new word reduce the number of result).