highlighting table rows, general bug fix

Current version:
-fixed the hightlighting of all rows when hover, no spacing between
cells
-white highlighting
-no button to click into message
-new message button made but not implemented
-all rows now are positioned a bit further apart and away from sides of
box
-gave class messageRow for quick style
-when clicking in, appears in the center of the screen
-can check for popup but might not implement

future changes
- fix known bug in the corner of table after collapsing
- move it into a real window
-implement new message
-.php file for sending the file.