Multiple bug fixes:
* updated FOV table to remove duplicates in same way as time course table now does, with override of equals method in FOV
* ...noting that this is used both in manual adding of FOV and in generation of Z stacks
* fixed bug with Z stacks whereby Longs and Doubles returned by JFormatttedTextField caused problems
* fixed bug such that now when selecting wells on the platemap, the direction in which drawing is performed doesn't matter
* fixed Clear current FOVs button such that plate map is updated appropriately.