OpenCytoPreprocessing.R : utilized file.path for a more generalized way for path generation

OpenCyto.css :
- attempt to protect OpenCyto modules from outside alteration of CSS line-height property ( via class .opencyto )
- fix for Safari not to cut off radio button group from below
- attempt to have exactly 2 fancy box full screen buttons

OpenCytoPreprocessing.js : analysis name and description are now cleared when new workspaces are picked