remove tabs and move to src/
cabal: move from autogeree.net to sourcephile.fr
version: bump to 2.4.3.20200228
stack: bump to lts-14.13
api: add CLI_Constant
parser: add exitWith calls where it makes sense.
api: improve CLI_Tag
parser: add Outputable instances for Maybe and Either
parser: add bytestring instances
haddock: fix wrongly parsed comment
clean up code
parser: add OnHandle
layout: add compact/full help switch
layout: add this alternative help rendition
parser: drop conflicting command prefixes
api: add alt
parser: fix expected commands
cabal: add categories
parser: add support for prefixes of commands
parser: improve error printing