Internal code changes for Python3

Python2 support was dropped and code has been updated to work with Python3 features. There is no change in functionality compared with 0.3.1 or 0.4.x releases.

Improve dialect detection for genery.com-produced files.

No changes in ged2doc code, new version is to build Windows app with latest
ged4py version (v0.2.4) which fixes Genery.com dialect detection.

Improve MS Office compatibility

• New module dumbemf implements a subset of EMF drawing primitives to
  support EMF representation of ancestor trees.
• Ancestor tree in ODT output is now in EMF format by default, there is an
  option to use SVG format as in previous versions

Fix issues introduced in previous release

Fix DateValue error and Python2 compatibility issues.

Improved DATE tag handling in ged4py

Using recent version of ged4py package which brings an improvements in handling of DATA tag in GEDCOM files.

Fix for crashes in reading images

Fixes for rare crashes while reading image EXIF data.

Windows installer aslo contains patched version of Pillow which is not released as of this moment (see python-pillow/Pillow#3337)

Add Czech translation

• Add Czech translation (kudos to @Mejstro)
• Add --locale option
• Fix for SVG file (ancestor trees) headers

Improve logging and error reporting

• Added --log option to log everything to a log file.
• Do not dump traceback to console, only print shorter and cleaner error message.

Fix for event date comparison

Fixes crash seen occasionally in the event sorting method.

Few fixes and improvements

• Fixed (hopefully) crash when dealing with GIF images.
• Added Polish translation (kudos to @voyager212)
• Improved image search algorithm for on-disk and zipped locations