Added .pymop.log to gitignore in the test astromdir.
Added ability to reset the colormap of an image back to default levels.
This is done using a keystroke as specified in the application config file 
(currently 'c').
Changed keybind for resetting colourmap to 's'.
#38: colourmap starts out reversed so that black is high and white is low.
Made circle around source blue instead of yellow to improve 
visibility on images where the colourmap has been inverted (which 
happens by default now).
Empty astrom files now get filtered out of the workload.
removed sublime files from repo
Merge pull request #40 from drusk/invert_colormap

Colormap adjustments
Merge pull request #41 from drusk/skip_empty_cands_files

Empty astrom files now get filtered out of the workload.
Discovery triplets now correctly identified. Both fields and blocks know their total number of precoveries, nailings and doubles.
now updates fwhm/zeropoint tags on dbimagse/expnum
Resolved merge conflict.