Easyleed

-----------

(NF):
- intensities are correctly saved as *.csv, along with spot and center locations
- added dependency: use of pandas dataframes for internal data tracking
- spots and center locations are saved/loaded as csv (old pkl format can still be read)
- fix crash when deselecting average plot after clearing plot
- UI: selecting a spot after analysis highlights the corresponding curve
- UI: Removing a spot also removes the corresponding curve
- Runs can now be paused-resumed with spots in different positions

-----------

(NF):
- revamp of configuration handling (now uses *.ini format)
- fixed crash if no image selected in file open widget
- changed filetype ending for spot position export to *.pkl
- some improvements to plotting ui

(AM):
- added (optional) peak detection algorithms from scikit-image to be used in
the tracking (beware: this feature is still experimental)
- optional dependencies (skimage, fits) can now be installed via pip

-------------

(Jan Lachnitt):
- preserve order and numbering of spots everywhere

(AM):
- load config from anywhere on the path as "easyleedconfig"

-------------

(Jan Lachnitt):
- fix to open/save with Qt4
- fix for 16-bit images
- more robust default regex for energy in filename

(AM):
- bug fixes to plotting and parameter import/export

-------------

- file loading now without needing to choose the file type

-------------

- added support for Qt5
- added filename defaults for the saving procedures
- fixes to logging mechanism