started reworking the sumstats
adds unit test
include unit tests in package
update Makefile
various changes
rewrite mostly complete
update documentation and unit test for simulations
update DESCRIPTION and NEWS
separate file for normalization functions

+ documentation
+ unit tests
add test setup for unit tests
remove legacy code
unified jaatha object naming
add more tests & fix some bugs
add more tests & documentation
change parallelization backend to 'parallel'
fix typo
fix imports to support 'parallel'
rework automatic execution of unit tests
adds fake vignettes to package
Merge branch 'v2.2' into array_sumstats

Conflicts:
	.gitignore
	DESCRIPTION
	DESCRIPTION.template