Test: merging simple tests developed on top og GH-16

Tests failed when running in main

GH-15: Try to deduce sh path on windows if it's not available from PATH

Also just use less without "sh -c" if we're on Windows.

correct output of --git-debug

Merging changes in GH main

Merge pager (#5)

python3: Fix comparison with None

an arithmetic comparisson against None used to work in python2... well, not anymore

Correcting management for binary files

print eol for hunk descriptor when using color