spit coloc2 numerical parameter results to IJ.log for easy scraping of results, eg in batch mode, and fix channel names in results bugs

hi guus, this just hackingly makes it easier to get the numerical results from coloc2 out of fiji into a spread sheet or R or whatever, as it was hard to scrape them from the default pdf results or the single window display results window... I also fixed bugs with the channel naming in the results, so it uses the real image names from the imp, which are hopefully different for each channel. 

this is a stopgap so a user who requested it can work more easily... next i need to add a proper save results as .csv function in addition to the existing pdf output option. 

cheers
Dan